High-magnification zoom lens system
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a high-magnification zoom lens system, and more specifically, to a high-magnification zoom lens system for use in a lens shutter camera. 
     2. Description of the Prior Art 
     Optical systems for use in lens shutter cameras are required to be compact and of high magnification. In recent years, high magnification is particularly required for such optical systems. 
     In order to realize a compacter lens system, in Japanese Laid-open Patent Application No. H3-127012, an arrangement is proposed having four lens elements grouped into two units with a zoom ratio of approximately 2 to 2.5×. In order to realize a higher magnification, three-unit zoom lens systems of positive, positive, negative configuration have been used since they are advantageous in performance correction and the amount of lens movement is small. 
     However, if a zoom ratio of 2.5 to 3× or higher is achieved in the two-unit, four-lens-element arrangement of Japanese Laid-open Patent Application No. H3-127012, it is difficult to secure a required performance, and the amount of lens movement is large. Consequently, it is impossible to realize a compact, high-magnification optical system. 
     In the above-mentioned three-unit zoom lens systems of positive, positive, negative configuration, because of the arrangement thereof, plus distortion is apt to be generated at a shorter focal length condition. Restraining this is one of the problems in designing such lens systems. Moreover, in positive first lens units of the three-unit lens systems of positive, positive, negative configuration, it is typical that the most object side lens element is convex to the object side. For this reason, more number of lens elements are required in order to correct the plus distortion generated at a shorter focal length condition. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a compact, low-cost, high-magnification zoom lens system with a zoom ratio of 2.5× or higher. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     This and other objects and features of this invention will become clear from the following description, taken in conjunction with the preferred embodiments with reference to the accompanied drawings in which: 
     FIG. 1 is a cross-sectional view showing the lens arrangement of a first embodiment of the present invention; 
     FIG. 2 is a cross-sectional view showing the lens arrangement of a second embodiment of the present invention; 
     FIG. 3 is a cross-sectional view showing the lens arrangement of a third embodiment of the present invention; 
     FIG. 4 is a cross-sectional view showing the lens arrangement of a fourth embodiment of the present invention; 
     FIG. 5 is a cross-sectional view showing the lens arrangement of a fifth embodiment of the present invention; 
     FIG. 6 is a cross-sectional view showing the lens arrangement of a sixth embodiment of the present invention; 
     FIG. 7 is a cross-sectional view showing the lens arrangement of a seventh embodiment of the present invention; 
     FIG. 8 is a cross-sectional view showing the lens arrangement of an eighth embodiment of the present invention; 
     FIGS. 9A to 9I show aberration curves of the first embodiment of the present invention; 
     FIGS. 10A to 10I show aberration curves of the second embodiment of the present invention; 
     FIGS. 11A to 11I show aberration curves of the third embodiment of the present invention; 
     FIGS. 12A to 12I show aberration curves of the fourth embodiment of the present invention; 
     FIGS. 13A to 13I show aberration curves of the fifth embodiment of the present invention; 
     FIGS. 14A to 14I show aberration curves of the sixth embodiment of the present invention; 
     FIGS. 15A to 15I show aberration curves of the seventh embodiment of the present invention; and 
     FIGS. 16A to 16I show aberration curves of the eighth embodiment of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the present invention, in order to realize a compact, high-magnification zoom lens system, a three-unit arrangement of positive, positive, negative configuration is employed. Specifically, the following arrangement is employed since in order to realize a compact zoom lens system, it is required to minimize the number of lens elements in each lens unit, particularly, to minimize the number of lens elements of the positive first lens unit which has a relatively large outside lens diameter. 
     A first implementation of a high-magnification zoom lens system according to the present invention comprises from the object side a positive first lens unit, a positive second lens unit and a negative third lens unit. Zooming is performed by varying the distance between each lens unit. The positive first lens unit includes two lens elements. The positive second lens unit and the negative third lens unit include at least two lens elements, respectively. Moreover, the following condition (1) is fulfilled: ##EQU2## where f1 represents a focal length of the positive first lens unit, and fW represents a focal length of the entire lens system at the shortest focal length condition. 
     The condition (1) limits the power of the positive first lens unit. If the power of the positive first lens unit is strong, the power of the positive second lens unit must be weak relatively thereto. This is because if both the power of the positive first lens unit and the power of the positive second lens unit are strong, a sufficient performance correction and a sufficient back focal length are incompatible with each other. Specifically, if f1/fW exceeds the lower limit of the condition (1), the back focal length is short at the shortest focal length condition. Since it is necessary to increase the effective aperture of the positive first lens unit in order to secure a sufficient off-axial illumination at the shortest focal length condition, it is impossible to provide an optical system whose size along the diameter is small. 
     If the power of the positive first lens unit is weak, the movement amount of each lens unit should be large, and the aberration performance thereof is close to the aberration performance of two-unit lens systems of positive, negative configuration. Specifically, if f1/fW exceeds the upper limit of the condition (1), merits presented by the three-unit arrangement cannot be obtained. As a result, it is impossible to realize a high magnification. 
     Preferably, the lower limit of the above-described condition (1) is 3.0 as shown in the following condition (1&#39;): ##EQU3## 
     Further, by providing the following arrangements to the optical system fulfilling the condition (1), a compact, high-magnification zoom lens system can be realized: zooming from the shortest focal length condition to a longest focal length condition is performed by moving each lens unit so that the distance between the positive first lens unit and the positive second lens unit increases and that the distance between the positive second lens unit and the negative third lens unit decreases, and the following condition (2) is fulfilled: ##EQU4## where f2 represents a focal length of the positive second lens unit. 
     As described above, in optical systems of this type, in order to secure a sufficient illumination and a sufficient performance, it is important that the power of the positive first lens unit and the power of the positive second lens unit are appropriately balanced. Specifically, if f1/f2 exceeds the lower limit of the condition (2), the power of the positive first lens unit is relatively strong, so that it is difficult to secure a sufficient back focal length and a sufficient off-axial illumination at the shortest focal length condition. If f1/f2 exceeds the upper limit of the condition (2), the power of the positive first lens unit is relatively weak, so that the merit of the three-unit arrangement that the amount of lens movement is small is not obtained and the aberration performance thereof is close to the aberration performance of the two-unit arrangement. As a result, the object of the present invention cannot be achieved. 
     Further, by providing the following arrangement to the optical system fulfilling the condition (2), a compact, high-performance, high-magnification zoom lens system can be realized: from the object side, the positive first lens unit includes a negative lens element and a positive lens element, the positive second lens unit includes a negative lens element and a positive lens element and the negative third lens unit includes a positive lens element and a negative lens element, and at least one aspherical surface is provided in the positive second lens unit and the negative third lens unit. 
     With this arrangement where each lens unit includes two lens elements, the size and the cost can effectively be reduced. When the negative third lens unit is of positive, positive, negative lens element configuration, the problem of securing a sufficient back focal length at a shorter focal length condition is inevitably presented. In the present invention, this problem is solved by providing a retro-type arrangement (i.e. negative, positive lens element configuration) to the positive first and second lens units. 
     In order to secure an excellent performance with a minimum number of lens elements, at least one aspherical surface is provided in each of the positive second lens unit and the negative third lens unit. The aspherical surface of the positive second lens unit is used to correct spherical aberration, while the aspherical surface of the negative third lens unit is used to correct off-axial coma and distortion. That is, in order to secure a more excellent performance, it is preferable to arrange an aspherical surface in each of the positive second lens unit and the negative third lens unit. 
     Regarding the arrangement of the aspherical surfaces, by employing bi-aspherical lens elements as the negative lens element of the positive second lens unit and as the positive lens element of the negative third lens unit, a zoom lens system having a higher performance can be realized. While two or more lens elements are required to control principal aberrations such as spherical aberration, coma and distortion, by employing a bi-aspherical lens, the control can De performed with only one lens element, and furthermore, delicate control is possible. This largely contributes to the reduction of the size. 
     Moreover, if the movement loci of the positive first lens unit and the negative third lens unit are the same, the movements of both lens units can be generated by the same cam. This leads to a simple arrangement, thereby reducing the cost. 
     A second implementation of the high-magnification zoom lens system according to the present invention comprises from the object side a positive first lens unit, a positive second lens unit and a negative third lens unit. Zooming is performed by varying the distance between each lens unit. The most object side lens element of the positive first lens unit is a negative lens element whose object side surface has a stronger negative refractive power than an image side surface. With this arrangement, a compact, low-cost, high-magnification zoom lens system can be realized. 
     By employing a negative lens element strongly concave to the object side as the most object side negative lens element of the positive first lens unit, the plus distortion generated at a shorter focal length condition can be corrected. As a result, a high-magnification zoom lens system having an excellent performance is realized. 
     Further, by employing a negative meniscus lens element as the most object side negative lens element of the positive first lens unit in the second implementation of the high-magnification zoom lens system according to the present invention, a high-magnification zoom lens system having a more excellent performance can be realized. 
     If a bi-concave lens element is employed as the most object side lens element of the positive first lens unit, negative power increases in the positive first lens unit, so that it is impossible to correct spherical aberration within the positive first lens unit. This problem is solved by increasing the number of lens elements in the positive first lens unit; however, this contradicts the reduction in size and cost. In this implementation, by employing a negative meniscus lens element as the most object side lens element of the positive first lens unit, simultaneous correction of distortion and spherical aberration is enabled. 
     Further, by providing the following arrangements to the above-described arrangement where the most object side lens element of the positive first lens unit is a negative meniscus lens element, a high-magnification zoom lens system having a more excellent performance can be realized: the most object side lens element of the positive first lens element is concave to the object side, and the following condition (3) is fulfilled: ##EQU5## where r1 represents a radius of curvature of the most object side surface of the positive first lens unit. 
     If |r1|/f1 exceeds the lower limit of the condition (3), the luminous fluxes incident on the first surface are caused to spring up largely, so that it is difficult to secure a sufficient performance. If |r1|/f1 exceeds the upper limit of the condition (3), the effect of correcting distortion is diminished. 
     The condition (3) limits the configuration of the most object side surface of the positive first lens unit. In order to secure a more excellent performance, the curvature, i.e. the meniscus degree of the film side surface of a first lens element (the most object side lens element of the positive first lens unit) is an important factor. 
     For example, an arrangement fulfilling the following condition (4) is preferable in securing a higher optical performance: ##EQU6## where r2 represents a radius of curvature of the film side surface of the most object side lens element of the positive first lens unit. 
     If the lower limit of the condition (4) is exceeded, it is necessary to increase the number of lens elements in order to eliminate aberrations within the positive first lens unit. When the upper limit of the condition (4) is exceeded, the effect of correcting distortion by the first surface is decreased, so that it is difficult to realize an excellent performance. 
     Preferably, the lower limit of the above-described condition (4) is 2.5 as shown in the following condition (4&#39;): ##EQU7## 
     Moreover, the following conditions (5) and (6) are preferably fulfilled: ##EQU8## where fT represents a focal length of the entire lens system at the longest focal length condition, and D1 represents the total length of the positive first lens unit. 
     The condition (5) limits the power of the positive first lens unit. If the power of the positive first lens unit is strong, the power of the positive second lens unit must be weak relatively thereto. This is because if both the power of the positive first lens unit and the power of the positive second lens unit are strong, a sufficient performance correction and a sufficient back focal length are incompatible with each other. Specifically, if f1.fT/fW exceeds the lower limit of the condition (5), the back focal length at the shortest focal length condition is short. Since it is necessary to increase the effective aperture of the positive first lens unit in order to secure a sufficient off-axial illumination at the shortest focal length condition, it is impossible to realize a zoom lens system whose size along the diameter is small. 
     If the power of the positive first lens unit is weak, the movement amount of each lens unit should be large, and the aberration performance thereof is close to the aberration performance of the two-unit lens systems of positive, negative configuration. Specifically, if f1.fT/fW exceeds the upper limit of the condition (5), merits presented by the three-unit arrangement cannot be obtained. As a result, it is impossible to realize a high magnification. 
     If the upper value of the condition (6) is exceeded, the size of the positive first lens unit should be large, so that it is difficult to reduce the size. Moreover, since the focal length of the positive first lens unit is short, aberration correction is difficult. If the lower limit of the condition (6) is exceeded, the focal length of the positive first lens unit is long, so that the lens movement amount for zooming is large. Moreover, it is impossible to secure sufficient holding portions at the peripheries of the lens elements constituting the positive first lens unit. 
     Numerical data of first to eighth embodiments of the present invention are shown in Tables 1 to 8, respectively. In each table, ri (i=1,2,3, . . . ) represents a radius of curvature of an ith lens surface counted from the object side, di (i=1,2,3, . . . ) represents an ith axial distance counted from the object side, Ni (i=1,2,3, . . . ) and vi (i=1,2,3, . . . ) represent a refractive index and an Abbe number, to the d-line, of an ith lens element counted from the object side, respectively. f represents a focal length of the entire lens system. FNO represents a minimum f-number. 
     In each table, surfaces marked with asterisks are aspherical surfaces, which are defined by the following equation (7): ##EQU9## where X represents a displacement amount from a reference surface along the optical axis, Y represents a height in a direction perpendicular to the optical axis, C represents a paraxial curvature, ε represents a conic constant, and Ai represents an lth-order aspherical coefficient. 
     FIGS. 1 to 8 are cross-sectional views showing the lens arrangements of the first to eighth embodiments, respectively, at the shortest focal length condition (W). Arrows m1, m2 and m3 schematically show the movement loci of the first, second and third lens units Gr1, Gr2 and Gr3, respectively, from the shortest focal length condition (W) to the longest focal length condition (T). The numerical values next to m1, m2 and m3 are movement amounts of the lens units Gr1, Gr2 and Gr3. 
     The first embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive bi-convex lens element, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive meniscus lens element convex to the image side and an aperture stop A, and a negative third lens unit Gr3 including a positive meniscus lens element convex to the image side and a negative meniscus lens element concave to the object side. 
     In the first embodiment, the following surfaces are aspherical: the object side surface of the negative meniscus lens element and the object side surface of the positive lens element of the positive first lens unit Gr1; both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the negative third lens unit Gr3. 
     The second embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive bi-convex lens element, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive bi-convex lens element and an aperture stop A, and a negative third lens unit Gr3 including a positive meniscus lens element convex to the image side and a negative meniscus lens element concave to the object side. 
     In the second embodiment, the following surfaces are aspherical: both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the negative third lens unit Gr3. 
     The third embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive bi-convex lens element, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive bi-convex lens element and an aperture stop A, and a negative third lens unit Gr3 including a positive meniscus lens element convex to the image side and a negative meniscus lens element concave to the image side. 
     In the third embodiment, the following surfaces are aspherical: the object side surface of the positive lens element of the positive first lens unit Gr1; both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the negative third lens unit Gr3. 
     The fourth embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive meniscus lens element convex to the object side, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive bi-convex lens element and an aperture stop A, and a third lens unit Gr3 including a positive meniscus lens element convex to the image side and a negative meniscus lens element concave to the object side. 
     In the fourth embodiment, the following surfaces are aspherical: the object side surface of the positive meniscus lens element of the positive first lens unit Gr1; both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the negative third lens unit Gr3. 
     The fifth embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive bi-convex lens element, a positive second lens unit Gr2 including a positive meniscus lens element convex to the object side, a negative bi-concave lens element and an aperture stop A, and a negative third lens unit Gr3 including a positive meniscus lens element convex to the image side and a negative bi-concave lens element. 
     In the fifth embodiment, the following surfaces are aspherical: the object side surface of the positive lens element of the positive first lens unit Gr1; the object side surface of the positive meniscus lens element convex to the image side of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the third lens unit Gr3. 
     The sixth embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive meniscus lens element convex to the image side, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive bi-convex lens element and an aperture stop A, and a negative third lens unit Gr3 including a positive meniscus lens element convex to the image side and two negative meniscus lens elements concave to the object side. 
     In the sixth embodiment, the following surfaces are aspherical: the object side surface of the positive meniscus lens element of the positive first lens unit Gr1; both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the negative third lens unit Gr3. 
     The seventh embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive meniscus lens element convex to the image side, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive bi-convex lens element and an aperture stop A, and a negative third lens unit Gr3 including a positive meniscus lens element convex to the image side and a negative meniscus lens element concave to the object side. 
     In the seventh embodiment, the following surfaces are aspherical: both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the positive meniscus lens element of the negative third lens unit Gr3. 
     The eighth embodiment comprises from the object side a positive first lens unit Gr1 including a negative meniscus lens element concave to the object side and a positive meniscus lens element convex to the object side, a positive second lens unit Gr2 including a negative meniscus lens element concave to the image side, a positive meniscus lens element convex to the image side and an aperture stop A, and a negative third lens unit Gr3 including two negative meniscus lens elements concave to the object side. 
     In the eight embodiment, the following surfaces are aspherical: the object side surface of the negative meniscus lens element and the object side surface of the positive meniscus lens element of the positive first lens unit Gr1; both side surfaces of the negative meniscus lens element of the positive second lens unit Gr2; and both side surfaces of the object side negative meniscus lens element of the negative third lens unit Gr3. 
     FIGS. 9A to 9I through 16A to 16I show aberration curves of the first to eighth embodiments. In each figure, (W) shows aberration at the shortest focal length condition, (M) shows aberration at the middle focal length condition, and (T) shows aberration at the longest focal length condition. Solid line d represents aberrations to d-line. Broken line SC represents sine condition. Broken line DM and solid line DS represent astigmatism on the meridional and sagittal surfaces, respectively. 
     Table 9 shows values of f1/fW and f1/f2 of the conditions (1) and (2) for the first to eighth embodiments. Table 10 shows values of |r1|/f1 and (r1+r2)/(r1-r2) of the conditions (3) and (4) for the first to eighth embodiments. Table 11 shows values of f1.fT/fW and D1/f1 of the conditions (5) and (6) for the first to eighth embodiment. 
     In the above-described embodiments, it is preferable that the following conditions (8) to (10) are further fulfilled: ##EQU10## where ω represents a half angle of view of the entire lens system at the shortest focal length condition, and y&#39; represents a maximum image height. 
     The conditions (8) and (10) define an appropriate power of the first lens unit similarly to the conditions, (1) and (5). The condition (9) defines an appropriate shortest focal length condition (shortest focal length). 
     As is clear from the above-mentioned embodiments, according to the present invention, a compact, low-cost, high-magnification zoom lens system with a zoom ratio of 2.5× or higher is realized. Particularly, by providing a zoom ratio of 2.5 to 3× or higher and minimizing the number of lens elements and the lens diameter, a compact, low-cost zoom lens system having a high performance is realized. Specifically, by minimizing the number of lens elements of the positive first lens unit and providing a novel characteristic to the most object side lens element of the positive first lens unit, an excellent aberration performance is realized with a simple arrangement where the number of lens elements are minimized. The total length and the diameter of the front lens element are much smaller than those of conventional lens systems. Thus, the present invention satisfactorily achieve the object thereof. 
     Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced other than as specifically described. 
     
                       TABLE 1                                                     
______________________________________                                    
(1st Embodiment)                                                          
f = 39.3 to 55.0 to 102.1                                                 
              FNO = 3.62 to 4.75 to 8.04                                  
Radius of  Axial      Refractive  Abbe                                    
Curvature  Distance   Index       Number                                  
______________________________________                                    
r1*   -24.637                                                             
               d1      1.500                                              
                            N1    1.80741                                 
                                        ν1                             
                                             31.59                        
r2    -32.135                                                             
               d2      0.500                                              
r3*   38.081                                                              
               d3      2.000                                              
                            N2    1.51680                                 
                                        ν2                             
                                             64.20                        
r4    -177.382                                                            
         d4    1.500 to 6.815 to 13.574                                   
r5*   22.727                                                              
               d5      2.500                                              
                            N3    1.84506                                 
                                        ν3                             
                                             23.66                        
r6*   17.030                                                              
               d6      4.276                                              
r7    -727.876                                                            
               d7      4.900                                              
                            N4    1.52307                                 
                                        ν4                             
                                             58.57                        
r8    -14.259                                                             
               d8      2.200                                              
r9    ∞ (Aperture stop)                                             
               d9      14.148 to 8.833 to 2.074                           
r10*  -25.302                                                             
                d10    2.758                                              
                            N5    1.58340                                 
                                        ν5                             
                                             30.23                        
r11   -20.895                                                             
                d11    3.298                                              
r12   -13.697                                                             
                d12    1.000                                              
                            N6    1.67790                                 
                                        ν6                             
                                             55.38                        
r13   -124.022                                                            
Aspherical Coefficients                                                   
r1   :ε = 0.10000 × 10                                      
     A4 = 0.22545 × 10.sup.-5                                       
     A6 = 0.41368 × 10.sup.-7                                       
     A8 = -0.95522 × 10.sup.-10                                     
     A10 = -0.24177 × 10.sup.-12                                    
     A12 = -0.17429 × 10.sup.-14                                    
r3   :ε =  0.10000 × 10                                     
     A4 = 0.35042 × 10.sup.-5                                       
     A6 =  0.26666 × 10.sup.-7                                      
     A8 = -0.59025 × 10.sup.-9                                      
     A10 = -0.25201 × 10.sup.-11                                    
     A12 = 0.54898 × 10.sup.-13                                     
r5   :ε = 0.10000 × 10                                      
     A4 = -0.12417 × 10.sup.-3                                      
     A6 = -0.97074 × 10.sup.-6                                      
     A8 = 0.12044 × 10.sup.-8                                       
     A10 = 0.66132 × 10.sup. -10                                    
     A12 = -0.15556 × 10.sup.-11                                    
r6   :ε = 0.10000 × 10                                      
     A4 = -0.10076 × 10.sup.-3                                      
     A6 = -0.14758 × 10.sup.-5                                      
     A8 = 0.24553 × 10.sup.-7                                       
     A10 = -0.21049 × 10.sup.-9                                     
     A12 = -0.16260 × 10.sup.-11                                    
     A14 = 0.65829 × 10.sup.-15                                     
     A16 = 0.58947 × 10.sup.-16                                     
r10  :ε = 0.10000 × 10                                      
     A3 = -0.42559 × 10.sup.-3                                      
     A4 = 0.24350 × 10.sup.-3                                       
     A5 = -0.41374 × 10.sup.-4                                      
     A6 = 0.44517 × 10.sup.-5                                       
     A7 = 0.73797 × 10.sup.-7                                       
     A8 = -0.45062 × 10.sup.-7                                      
     A9 = -0.42551 × 10.sup.-9                                      
     A10 = 0.33908 × 10.sup.-9                                      
     A11 = 0.79128 × 10.sup.-11                                     
     A12 = -0.20278 × 10.sup.-11                                    
     A13 = 0.60303 × 10.sup.-15                                     
     A14 = 0.64064 × 10.sup.-15                                     
     A15 = 0.10109 × 10.sup.-15                                     
     A16 = 0.11619 × 10.sup.-16                                     
r11  :ε = 0.10000 × 10                                      
     A3 = -0.40645 × 10.sup.-3                                      
     A4 = 0.14149 × 10.sup.-3                                       
     A5 = -0.12074 × 10.sup.-4                                      
     A6 = -0.24598 × 10.sup.-6                                      
     A7 = 0.39639 × 10.sup.-7                                       
     A8 = 0.41323 × 10.sup.-7                                       
     A9 = -0.66676 × 10.sup.-8                                      
     A10 = 0.10617 × 10.sup.-9                                      
     A11 = 0.30611 × 10.sup.-10                                     
     A12 = -0.13930 × 10.sup.-11                                    
     A13 = -0.15678 × 10.sup.-14                                    
______________________________________                                    
 
    
     
                       TABLE 2                                                     
______________________________________                                    
(2nd Embodiment)                                                          
f = 39.3 to 55.0 to 116.4                                                 
              FNO = 3.62 to 4.89 to 9.78                                  
Radius of  Axial      Refraction  Abbe                                    
Curvature  Distance   Index       Number                                  
______________________________________                                    
r1    -17.326                                                             
               d1      1.500                                              
                            N1    1.83400                                 
                                        ν1                             
                                             37.05                        
r2    -30.899                                                             
               d2      1.000                                              
r3    1052.587                                                            
               d3      2.000                                              
                            N2    1.51680                                 
                                        ν2                             
                                             64.20                        
r4    -20.348                                                             
         d4    1.500 to 6.178 to 12.686                                   
r5*   19.265                                                              
               d5      2.500                                              
                            N3    1.84666                                 
                                        ν3                             
                                             23.82                        
r6*   16.277                                                              
               d6      4.705                                              
r7    209.666                                                             
               d7      4.900                                              
                            N4    1.51680                                 
                                        ν4                             
                                             64.20                        
r8    -16.618                                                             
               d8      2.200                                              
r9    ∞ (Aperture stop)                                             
         d9    13.260 to 8.583 to 2.074                                   
r10*  -40.629                                                             
                d10    2.500                                              
                            N5    1.58340                                 
                                        ν5                             
                                             30.23                        
r11*  -21.069                                                             
                d11    3.125                                              
r12   -12.170                                                             
                d12    1.000                                              
                            N6    1.80100                                 
                                        ν6                             
                                             46.54                        
r13   -112.448                                                            
Aspherical Coefficients                                                   
r5   :ε = 0.10000 × 10                                      
     A4 = -0.97544 × 10.sup.-4                                      
     A6 = -0.10716 × 10.sup.-5                                      
     A8 = 0.10311 × 10.sup.-8                                       
     A10 = 0.66101 × 10.sup.-10                                     
     A12 = -0.15569 × 10.sup.-11                                    
r6   :ε = 0.10000 × 10                                      
     A4 = -0.89731 × 10.sup.-4                                      
     A6 = -0.17068 × 10.sup.-5                                      
     A8 = 0.23481 × 10.sup.-7                                       
     A10 = -0.21301 × 10.sup.-9                                     
     A12 = -0.16296 × 10.sup.-11                                    
     A14 = 0.65829 × 10.sup.-15                                     
     A16 = 0.58947 × 10.sup.-16                                     
r10  :ε = 0.10000 × 10                                      
     A3 = -0.48875 × 10.sup.-3                                      
     A4 = 0.24712 × 10.sup.-3                                       
     A5 = -0.41550 × 10.sup.-4                                      
     A6 = 0.45239 × 10.sup.-5                                       
     A7 = 0.79939 × 10.sup.-7                                       
     A8 = -0.44781 × 10.sup.-7                                      
     A9 = -0.42511 × 10.sup.-9                                      
     A10 = 0.33770 × 10.sup.-9                                      
     A11 = 0.79128 × 10.sup.-11                                     
     A12 = -0.20467 × 10.sup.-11                                    
     A13 = 0.60303 × 10.sup.-15                                     
     A14 = 0.64064 × 10.sup.-15                                     
     A15 = 0.10109 × 10.sup.-15                                     
     A16 = 0.11619 × 10.sup.-16                                     
r11  :ε = 0.10000 × 10                                      
     A3 = -0.46929 × 10.sup.-3                                      
     A4 = 0.13287 × 10.sup.-3                                       
     A5 = -0.12024 × 10.sup.-4                                      
     A6 = -0.26548 × 10.sup.-6                                      
     A7 = 0.40398 × 10.sup.-7                                       
     A8 = 0.41554 × 10.sup.-7                                       
     A9 = -0.67388 × 10.sup.- 8                                     
     A10 = 0.11910 × 10.sup.-9                                      
     A11 = 0.30611 × 10.sup.-10                                     
     A12 = -0.15480 × 10.sup.-11                                    
     A13 = -0.15678 × 10.sup.-14                                    
______________________________________                                    
 
    
     
                       TABLE 3                                                     
______________________________________                                    
(3rd Embodiment)                                                          
f = 39.1 to 55.0 to 131.0                                                 
              FNO = 3.62 to 4.94 to 11.24                                 
Radius of  Axial      Refraction  Abbe                                    
Curvature  Distance   Index       Number                                  
______________________________________                                    
r1    -23.671                                                             
               d1      1.500                                              
                            N1    1.80741                                 
                                        ν1                             
                                             31.59                        
r2    -34.019                                                             
               d2      1.500                                              
r3*   68.124                                                              
               d3      2.000                                              
                            N2    1.51823                                 
                                        ν2                             
                                             58.96                        
r4    -65.497                                                             
         d4    1.500 to 5.730 to 12.128                                   
r5*   19.271                                                              
               d5      2.500                                              
                            N3    1.84666                                 
                                        ν3                             
                                             23.82                        
r6*   15.460                                                              
               d6      4.669                                              
r7    93.387                                                              
               d7      4.900                                              
                            N4    1.51680                                 
                                        ν4                             
                                             64.20                        
r8    -15.313                                                             
               d8      2.200                                              
r9    ∞ (Aperture stop)                                             
               d9      12.702 to 8.472 to 2.074                           
r10*  -28.022                                                             
                d10    2.397                                              
                            N5    1.58340                                 
                                        ν5                             
                                             30.23                        
r11*  -18.622                                                             
                d11    3.186                                              
r12   -11.005                                                             
                d12    1.000                                              
                            N6    1.77250                                 
                                        ν6                             
                                             49.77                        
r13   -65.989                                                             
Aspherical Coefficients                                                   
r3   :ε = 0.10000 × 10                                      
     A4 = 0.71213 × 10.sup.-5                                       
     A6 = 0.99367 × 10.sup.-7                                       
     A8 = -0.73631 × 10.sup.-9                                      
     A10 = -0.35881 × 10.sup.-11                                    
     A12 = 0.42528 × 10.sup.-13                                     
r5   :ε = 0.10000 × 10                                      
     A4 = -0.10518 × 10.sup.-3                                      
     A6 = -0.10874 × 10.sup.-5                                      
     A8 = 0.87759 × 10.sup.-9                                       
     A10 = 0.65258 × 10.sup.-10                                     
     A12 = -0.15595 × 10.sup.-11                                    
r6   :ε = 0.10000 × 10                                      
     A4 = -0.89939 × 10.sup.-4                                      
     A6 = -0.16247 × 10.sup.-5                                      
     A8 = 0.23947 × 10.sup.-7                                       
     A10 = -0.21136 × 10.sup.-9                                     
     A12 = -0.16251 × 10.sup.-11                                    
     A14 = 0.65829 × 10.sup.-15                                     
     A16 = 0.58947 × 10.sup.-16                                     
r10  :ε = 0.10000 × 10                                      
     A3 = -0.51959 × 10.sup.-3                                      
     A4 = 0.24968 × 10.sup.-3                                       
     A5 = -0.40581 × 10.sup.-4                                      
     A6 = 0.46041 × 10.sup.-5                                       
     A7 = 0.84834 × 10.sup.-7                                       
     A8 = -0.44497 × 10.sup.-7                                      
     A9 = -0.42511 × 10.sup.-9                                      
     A10 = 0.33876 × 10.sup.-9                                      
     A11 = 0.79128 × 10.sup.-11                                     
     A12 = -0.20503 × 10.sup.-11                                    
     A13 = 0.60303 × 10.sup.-15                                     
     A14 = 0.64064 × 10.sup.-15                                     
     A15 = 0.10109 × 10.sup.-15                                     
     A16 = 0.11619 × 10.sup.-16                                     
r11  :ε = 0.10000 × 10                                      
     A3 = -0.52687 × 10.sup.-3                                      
     A4 = 0.13356 × 10.sup.-3                                       
     A5 = -0.12412 × 10.sup.-4                                      
     A6 = -0.30313 × 10.sup.-6                                      
     A7 = 0.38692 × 10.sup.-7                                       
     A8 = 0.39750 × 10.sup.-7                                       
     A9 = -0.63909 × 10.sup.-8                                      
     A10 = 0.14162 × 10.sup.-9                                      
     A11 = 0.30611 × 10.sup.-10                                     
     A12 = -0.19509 × 10.sup.-11                                    
     A13 = -0.15678 × 10.sup.-14                                    
______________________________________                                    
 
    
     
                       TABLE 4                                                     
______________________________________                                    
(4th Embodiment)                                                          
f = 39.3 to 55.0 to 102.1                                                 
              FNO = 3.62 to 4.97 to 9.02                                  
Radius of  Axial      Refraction  Abbe                                    
Curvature  Distance   Index       Number                                  
______________________________________                                    
r1    -28.310                                                             
               d1      1.500                                              
                            N1    1.80741                                 
                                        ν1                             
                                             31.59                        
r2    -34.946                                                             
               d2      1.500                                              
r3*   40.812                                                              
               d3      2.000                                              
                            N2    1.51680                                 
                                        ν2                             
                                             64.20                        
r4    92.711                                                              
         d4    1.500 to 7.505 to 14.647                                   
r5*   22.815                                                              
               d5      2.500                                              
                            N3    1.84506                                 
                                        ν3                             
                                             23.66                        
r6*   18.596                                                              
               d6      3.865                                              
r7    223.647                                                             
               d7      4.900                                              
                            N4    1.51728                                 
                                        ν4                             
                                             69.43                        
r8    -14.626                                                             
               d8      2.200                                              
r9    ∞ (Aperture stop)                                             
               d9      15.221 to 9.216 to 2.074                           
r10*  -25.824                                                             
                d10    2.733                                              
                            N5    1.58340                                 
                                        ν5                             
                                             30.23                        
r11*  -21.854                                                             
                 d11   4.371                                              
r12   -14.698                                                             
                d12    1.000                                              
                            N6    1.67000                                 
                                        ν6                             
                                             57.07                        
r13   -116.707                                                            
Aspherical Coefficients                                                   
r3   :ε = 0.10000 × 10                                      
     A4 = 0.80817 × 10.sup.-5                                       
     A6 = 0.47524 × 10.sup.-7                                       
     A8 = -0.90286 × 10.sup.-10                                     
     A10 = -0.35563 × 10.sup.-11                                    
     A12 = 0.40562 × 10.sup.-14                                     
r5   :ε = 0.10000 × 10                                      
     A4 = -0.12769 × 10.sup.-3                                      
     A6 = -0.10537 × 10.sup.-5                                      
     A8 = 0.18690 × 10.sup.-8                                       
     A10 = 0.71924 × 10.sup.-10                                     
     A12 = -0.15257 × 10.sup.-11                                    
r6   :ε = 0.10000 × 10                                      
     A4 = -0.10173 × 10.sup.-3                                      
     A6 = -0.14103 × 10.sup.-5                                      
     A8 = 0.24573 × 10.sup.-7                                       
     A10 = -0.21112 × 10.sup.-9                                     
     A12 = -0.16323 × 10.sup.-11                                    
     A14 = 0.65829 × 10.sup.-15                                     
     A16 = 0.58947 × 10.sup.-16                                     
r10  :ε = 0.10000 × 10                                      
     A3 = -0.46759 × 10.sup.-3                                      
     A4 = 0.24869 × 10.sup.-3                                       
     A5 = -0.41484 × 10.sup.-4                                      
     A6 = 0.44842 × 10.sup.-5                                       
     A7 = 0.75332 × 10.sup.-7                                       
     A8 = -0.45065 × 10.sup.-7                                      
     A9 = -0.42511 × 10.sup.-9                                      
     A10 = 0.33778 × 10.sup.-9                                      
     A11 = 0.79128 × 10.sup.-11                                     
     A12 = -0.20491 × 10.sup.-11                                    
     A13 = 0.60303 × 10.sup.-15                                     
     A14 = 0.64064 × 10.sup.-15                                     
     A15 = 0.10109 × 10.sup.-15                                     
     A16 = 0.11619 × 10.sup.-16                                     
r11  :ε = 0.10000 × 10                                      
     A3 = -0.41109 ×  10.sup.-3                                     
     A4 = 0.14450 × 10.sup.-3                                       
     A5 = -0.11422 × 10.sup.-4                                      
     A6 = -0.24553 × 10.sup.-6                                      
     A7 = 0.40954 × 10.sup.-7                                       
     A8 = 0.42801 × 10.sup.-7                                       
     A9 = -0.67605 × 10.sup.-8                                      
     A10 = 0.11349 × 10.sup.-9                                      
     A11 = 0.30611 × 10.sup.-10                                     
     A12 = -0.14557 × 10.sup.-11                                    
     A13 = -0.15678 × 10.sup.-14                                    
______________________________________                                    
 
    
     
                       TABLE 5                                                     
______________________________________                                    
(5th Embodiment)                                                          
______________________________________                                    
f = 39.1 to 55.0 to 116.4 FNO = 3.62 to 4.95 to 10.06                     
Radius of Axial        Refractive Abbe                                    
Curvature Distance     Index      Number                                  
______________________________________                                    
r1   -19.626                                                              
                d1     1.500 N1   1.80750                                 
                                         ν1                            
                                             35.43                        
r2   -32.104                                                              
                d2     1.000                                              
r3*  143.565                                                              
                d3     2.000 N2   1.51680                                 
                                         ν2                            
                                             64.20                        
r4   -29.168                                                              
          d4   1.500 to 5.212 to 10.311                                   
r5   28.367                                                               
                d5     4.247 N3   1.54072                                 
                                         ν3                            
                                             47.22                        
r6   253.548                                                              
                d6     0.845                                              
r7   -69.892                                                              
                d7     3.168 N4   1.80500                                 
                                         ν4                            
                                             40.97                        
r8   121.833                                                              
                d8     2.500                                              
r9   ∞ (Aperture stop)                                              
                d9     2.600                                              
r10* -135.135                                                             
                d10    2.173 N5   1.58400                                 
                                         ν5                            
                                             31.00                        
r11  -82.950                                                              
                d11    3.027                                              
r12  67.090                                                               
                d12    4.932 N6   1.49310                                 
                                         ν6                            
                                             83.58                        
r13  -19.492                                                              
           d13 10.886 to 7.174 to 2.074.                                  
r14* -35.497                                                              
                d14    2.335 N7   1.58340                                 
                                         ν7                            
                                             30.23                        
r15* -23.461                                                              
                d15    3.211                                              
r16  -12.629                                                              
                d16    1.000 N8   1.77250                                 
                                         ν8                            
                                             49.77                        
r17  829.579                                                              
______________________________________                                    
Aspherical Coefficients                                                   
______________________________________                                    
r3:         ε = 0.10000 × 10                                
            A4 = 0.18053 × 10.sup.-5                                
            A6 = 0.37365 × 10.sup.-6                                
            A8 = -0.12463 × 10.sup.-7                               
            A10 = 0.18326 × 10.sup.-9                               
            A12 = -0.96454 × 10.sup.-12                             
r10:        ε = 0.10000 × 10                                
            A4 = -0.38629 × 10.sup.-4                               
            A6 = -0.65195 × 10.sup.-6                               
            A8 = 0.98473 × 10.sup.-8                                
            A10 = -0.62355 × 10.sup.-11                             
            A12 = -0.14515 × 10.sup.-12                             
r14:        ε = 0.10000 × 10                                
            A3 = -0.49848 × 10.sup.-3                               
            A4 = 0.24903 × 10.sup.-3                                
            A5 = -0.41162 × 10.sup.-4                               
            A6 = 0.54818 × 10.sup.-5                                
            A7 = 0.81797 × 10.sup.-7                                
            A8 = -0.51475 × 10.sup.-7                               
            A9 = -0.42511 × 10.sup.-9                               
            A10 = 0.35170 × 10.sup.-9                               
            A11 = 0.79128 × 10.sup.-11                              
            A12 = -0.18239 × 10.sup.-11                             
            A13 = 0.60303 × 10.sup.-15                              
            A14 = 0.64064 × 10.sup.-15                              
            A15 = 0.10109 × 10.sup.-15                              
            A16 = 0.11619 × 10.sup.-16                              
r15:        ε = 0.10000 × 10                                
            A3 = -0.49448 × 10.sup.-3                               
            A4 = 0.13310 × 10.sup.-3                                
            A5 = -0.12134 × 10.sup.-4                               
            A6 = -0.74522 × 10.sup.-6                               
            A7 = 0.39796 × 10.sup.- 7                               
            A8 = 0.31759 × 10.sup.-7                                
            A9 = -0.66232 × 10.sup.-8                               
            A10 = 0.19651 × 10.sup.-9                               
            A11 = 0.30611 × 10.sup.-10                              
            A12 = -0.16945 × 10.sup.-11                             
            A13 = -0.15678 × 10.sup.-14                             
______________________________________                                    
 
    
     
                       TABLE 6                                                     
______________________________________                                    
(6th Embodiment)                                                          
______________________________________                                    
f = 39.1 to 55.0 to 116.4 FNO = 3.62 to 4.95 to 10.07                     
Radius of Axial        Refractive Abbe                                    
Curvature Distance     Index      Number                                  
______________________________________                                    
r1   -16.094                                                              
                d1     1.500 N1   1.80750                                 
                                         ν1                            
                                             35.43                        
r2   -31.747                                                              
                d2     1.000                                              
r3*  -324.726                                                             
                d3     2.000 N2   1.51680                                 
                                         ν2                            
                                             64.20                        
r4   -17.540                                                              
          d4   1.500 to 5.626 to 11.274                                   
r5*  18.400                                                               
                d5     2.500 N3   1.84666                                 
                                         ν3                            
                                             23.82                        
r6*  16.017                                                               
                d6     4.302                                              
r7   210.839                                                              
                d7     4.900 N4   1.51680                                 
                                         ν4                            
                                             64.20                        
r8   -16.613                                                              
                d8     2.200                                              
r9   ∞ (Aperture stop)                                              
                d9     11.848 to 7.722 to 2.074                           
r10* -42.608                                                              
                d10    2.700 N5   1.62060                                 
                                         ν5                            
                                             38.26                        
r11* -17.935                                                              
                d11    2.302                                              
r12  -16.442                                                              
                d12    1.500 N6   1.77250                                 
                                         ν6                            
                                             49.77                        
r13  -114.675                                                             
                d13    3.700                                              
r14  -14.598                                                              
                d14    1.800 N7   1.77250                                 
                                         ν7                            
                                             49.77                        
r15  -33.373                                                              
______________________________________                                    
Aspherical Coefficients                                                   
______________________________________                                    
r3:         ε = 0.10000 × 10                                
            A4 = -0.55979 × 10.sup.-5                               
            A6 = 0.59183 × 10.sup.-7                                
            A8 = -0.12537 × 10.sup.-8                               
            A10 = -0.20077 × 10.sup.-11                             
            A12 = 0.92220 × 10.sup.-13                              
r5:         ε = 0.10000 × 10                                
            A4 = -0.98155 × 10.sup.-4                               
            A6 = -0.10422 × 10.sup.-5                               
            A8 = 0.10279 × 10.sup.-8                                
            A10 = 0.65717 × 10.sup.-10                              
            A12 = -0.15580 × 10.sup.-11                             
r6:         ε = 0.10000 × 10                                
            A4 = -0.88888 × 10.sup.-4                               
            A6 = -0.17112 × 10.sup.-5                               
            A8 = 0.23555 × 10.sup. -7                               
            A10 = -0.21244 × 10.sup.-9                              
            A12 = -0.16260 × 10.sup.-11                             
            A14 = 0.65829 × 10.sup.-15                              
            A15 = 0.10109 × 10.sup.-15                              
            A16 = 0.58947 × 10.sup.-16                              
r10:        ε = 0.10000 × 10                                
            A3 = 0.90026 × 10.sup.-4                                
            A4 = 0.56438 × 10.sup.-5                                
            A5 = 0.23499 × 10.sup.-6                                
            A6 = 0.17749 × 10.sup.-8                                
            A7 = -0.11063 × 10.sup.-8                               
            A8 = -0.18141 × 10.sup.-9                               
            A10 = -0.20996 × 10.sup.-11                             
            A12 = -0.16717 × 10.sup.-13                             
r11:        ε = 0.10000 × 10                                
            A3 = 0.53323 × 10.sup.-4                                
            A4 = 0.34115 × 10.sup.-6                                
            A5 = -0.20566 × 10.sup.-7                               
            A6 = -0.45581 × 10.sup.-8                               
            A7 = -0.42636 × 10.sup.-9                               
            A8 = -0.23354 × 10.sup.-8                               
            A9 = -0.38630 × 10.sup.-10                              
            A10 = 0.71526 × 10.sup.-11                              
            A12 = 0.27829 × 10.sup.-13                              
______________________________________                                    
 
    
     
                       TABLE 7                                                     
______________________________________                                    
(7th Embodiment)                                                          
______________________________________                                    
f = 39.1 to 55.0 to 116.4 FNO = 3.62 to 5.01 to 10.39                     
Radius of Axial        Refractive Abbe                                    
Curvature Distance     Index      Number                                  
______________________________________                                    
r1   -17.326                                                              
                d1     1.500 N1   1.83400                                 
                                         ν1                            
                                             37.05                        
r2   -32.356                                                              
                d2     1.000                                              
r3   -84.420                                                              
                d3     2.000 N2   1.51680                                 
                                         ν2                            
                                             64.20                        
r4   -18.390                                                              
          d4   1.500 to 6.497 to 13.175                                   
r5*  19.799                                                               
                d5     2.500 N3   1.84666                                 
                                         ν3                            
                                             23.82                        
r6*  17.489                                                               
                d6     4.670                                              
r7   109.536                                                              
                d7     4.900 N4   1.51728                                 
                                         ν4                            
                                             69.43                        
r8   -17.288                                                              
                d8     2.200                                              
r9   ∞ (Aperture stop)                                              
          d9   13.749 to 8.752 to 2.074                                   
r10* -44.226                                                              
                d10    2.500 N5   1.58340                                 
                                         ν5                            
                                             30.23                        
r11* -23.061                                                              
                d11    3.960                                              
r12  -12.620                                                              
                d12    1.000 N6   1.80100                                 
                                         ν6                            
                                             46.54                        
r13  -101.086                                                             
______________________________________                                    
Aspherical Coefficients                                                   
______________________________________                                    
r5:         ε = 0.10000 × 10                                
            A4 = -0.96293 × 10.sup.-4                               
            A6 = -0.10790 × 10.sup.-5                               
            A8 = 0.66237 × 10.sup.-9                                
            A10 = 0.62309 × 10.sup.-10                              
            A12 = -0.15821 × 10.sup.-11                             
r6:         ε = 0.10000 × 10                                
            A4 = -0.85071 × 10.sup.-4                               
            A6 = -0.17248 × 10.sup.-5                               
            A8 = 0.23658 × 10.sup.-7                                
            A10 = -0.21055 × 10.sup.-9                              
            A12 = -0.16128 × 10.sup.-11                             
            A14 = 0.65829 × 10.sup.-15                              
            A16 = 0.58947 × 10.sup.-16                              
r10:        ε = 0.10000 × 10                                
            A3 = -0.48004 × 10.sup.-3                               
            A4 = 0.24423 × 10.sup.-3                                
            A5 = -0.41952 × 10.sup.-4                               
            A6 = 0.44991 × 10.sup.-5                                
            A7 = 0.78986 × 10.sup.-7                                
            A8 = -0.44782 × 10.sup.-7                               
            A9 = -0.42511 × 10.sup.-9                               
            A10 = 0.33847 × 10.sup.-9                               
            A11 = 0.79128 × 10.sup.-11                              
            A12 = -0.20360 × 10.sup.-11                             
            A13 = 0.60303 × 10.sup.-15                              
            A14 = 0.64064 × 10.sup.-15                              
            A15 = 0.10109 × 10.sup.-15                              
            A16 = 0.11619 × 10.sup.-16                              
r11:        ε = 0.10000 × 10                                
            A3 = -0.44519 × 10.sup.-3                               
            A4 = 0.13367 × 10.sup.-3                                
            A5 = -0.11881 × 10.sup.-4                               
            A6 = -0.25451 × 10.sup.-6                               
            A7 = 0.40874 × 10.sup.-7                                
            A8 = 0.42209 × 10.sup.-7                                
            A9 = -0.68161 × 10.sup.-8                               
            A10 =  0.11361 × 10.sup.-9                              
            A11 = 0.30611 × 10.sup.-10                              
            A12 = -0.14290 × 10.sup.-11                             
            A13 = -0.15678 × 10.sup.-14                             
______________________________________                                    
 
    
     
                       TABLE 8                                                     
______________________________________                                    
(8th Embodiment)                                                          
______________________________________                                    
f = 39.3 to 55.0 to 102.1 FNO = 3.62 to 4.6 to 7.35                       
Radius of Axial        Refractive Abbe                                    
Curvature Distance     Index      Number                                  
______________________________________                                    
r1*  -32.000                                                              
                d1     1.500 N1   1.80741                                 
                                         ν1                            
                                             31.59                        
r2   -41.366                                                              
                d2     0.500                                              
r3*  22.628                                                               
                d3     2.000 N2   1.51728                                 
                                         ν2                            
                                             69.43                        
r4   126.263                                                              
          d4   1.500 to 6.537 to 13.177                                   
r5*  19.795                                                               
                d5     2.500 N3   1.84506                                 
                                         ν3                            
                                             23.66                        
r6*  14.388                                                               
                d6     4.799                                              
r7   -503.890                                                             
                d7     4.900 N4   1.52307                                 
                                         ν4                            
                                             58.57                        
r8   -13.707                                                              
                d8     2.200                                              
r9   ∞ (Aperture stop)                                              
          d9   13.751 to 8.714 to 2.074                                   
r10* -20.339                                                              
                d10    2.758 N5   1.58340                                 
                                         ν5                            
                                             30.23                        
r11* -21.454                                                              
                d11    1.791                                              
r12  -15.248                                                              
                d12    1.000 N6   1.61800                                 
                                         ν6                            
                                             63.39                        
r13  -797.932                                                             
______________________________________                                    
Aspherical Coefficients                                                   
______________________________________                                    
r1:         ε = 0.10000 × 10                                
            A4 = 0.71231 × 10.sup.-7                                
            A6 = 0.52195 × 10.sup.-7                                
            A8 = -0.25359 × 10.sup.-9                               
            A10 = -0.39813 × 10.sup.-12                             
            A12 = 0.17476 × 10.sup.-14                              
r3:         ε = 0.10000 × 10                                
            A4 = 0.35042 × 10.sup.-5                                
            A6 = 0.23103 × 10.sup.-7                                
            A8 = -0.67780 × 10.sup.-9                               
            A10 = -0.15550 × 10.sup.-11                             
            A12 = 0.74233 × 10.sup.-13                              
r5:         ε = 0.10000 × 10                                
            A4 = -0.12239 × 10.sup.-3                               
            A6 = -0.90107 × 10.sup.-6                               
            A8 = 0.11554 × 10.sup.-8                                
            A10 = 0.64400 × 10.sup.-10                              
            A12 = -0.15674 × 10.sup.-11                             
r6:         ε  = 0.10000 × 10                               
            A4 = -0.10076 × 10.sup.-3                               
            A6 = -0.14758 × 10.sup.-5                               
            A8 = 0.24553 × 10.sup.-7                                
            A10 = -0.20994 × 10.sup.-9                              
            A12 = -0.16222 × 10.sup.-11                             
            A14 = 0.65829 × 10.sup.-15                              
            A15 = 0.58947 × 10.sup.-16                              
r10:        ε = 0.10000 × 10                                
            A3 = -0.42559 × 10.sup.-3                               
            A4 = 0.24016 × 10.sup.-3                                
            A5 = -0.41374 × 10.sup.-4                               
            A6 = 0.44519 × 10.sup.-5                                
            A7 = 0.73797 × 10.sup.-7                                
            A8 = -0.44807 × 10.sup.-7                               
            A9 = -0.42511 × 10.sup.-9                               
            A10 = 0.34232 × 10.sup.-9                               
            A11 = 0.79128 × 10.sup.-11                              
            A12 = -0.19916 × 10.sup.-11                             
            A13 = 0.60303 ×  10.sup.-15                             
            A14 = 0.64064 × 10.sup.-15                              
            A15 = 0.10109 × 10.sup.-15                              
            A16 = 0.11619 × 10.sup.-16                              
r11:        ε = 0.10000 × 10                                
            A3 = -0.40645 × 10.sup.-3                               
            A4 = 0.13873 × 10.sup.-3                                
            A5 = -0.12074 × 10.sup.-4                               
            A6 = -0.24438 × 10.sup.-6                               
            A7 = 0.39639 × 10.sup.-7                                
            A8 = 0.40410 × 10.sup.-7                                
            A9 = -0.66676 × 10.sup.-8                               
            A10 = 0.11883 × 10.sup.-9                               
            A11 = 0.30611 × 10.sup.-10                              
            A12 = -0.13772 × 10.sup.-11                             
            A13 = -0.15678 × 10.sup.-14                             
______________________________________                                    
 
    
     
                       TABLE 9                                                     
______________________________________                                    
                  ##STR1##                                                
                       ##STR2##                                           
______________________________________                                    
1st embodiment     2.60   2.76                                            
2nd embodiment     3.20   3.46                                            
3rd embodiment     3.93   4.77                                            
4th embodiment     10.2   10.3                                            
5th embodiment     3.41   4.26                                            
6th embodiment     3.65   4.08                                            
7th embodiment     8.53   10.03                                           
8th embodiment     1.82   1.88                                            
______________________________________                                    
 
    
     
                       TABLE 10                                                    
______________________________________                                    
                 ##STR3##                                                 
                      ##STR4##                                            
______________________________________                                    
1st embodiment    0.240  7.58                                             
2nd embodiment    0.139  3.55                                             
3rd embodiment    0.150  5.59                                             
4th embodiment    0.085  9.52                                             
5th embodiment    0.147  4.14                                             
6th embodiment    0.113  3.06                                             
7th embodiment    0.052  3.30                                             
8th embodiment    0.448  7.81                                             
______________________________________                                    
 
    
     
                       TABLE 11                                                    
______________________________________                                    
                 ##STR5##                                                 
                        ##STR6##                                          
______________________________________                                    
1st embodiment    273      0.039                                          
2nd embodiment    384      0.036                                          
3rd embodiment    531      0.033                                          
4th embodiment    1071     0.015                                          
5th embodiment    409      0.034                                          
6th embodiment    438      0.031                                          
7th embodiment    1022     0.014                                          
8th embodiment    191      0.056                                          
______________________________________