1. Field of the Invention
This invention relates to an eye fundus photographing apparatus for photographing the fundus of an eye to be examined.
2. Related Background Art
Usually, when photographing the fundus of an eye to be examined having a small pupil diameter, it is more advantageous to photograph at a narrow field angle of a high magnification than to photograph at a wide field angle of a low magnification. However, when photographing at a narrow angle of field, as compared with the photographing at a wide angle of field, the quantity of photographing light is reduced and therefore, in Japanese Patent Publication No. 63-36251, a baffle comprising a circular light intercepting plate is installed in an illuminating optical system with a view to prevent the harmful effects of reflected light from the front face of the cornea or the rear face of the crystalline lens, and as the field angle is made narrower, the diameter of the baffle is made smaller so as to increase the quantity of photographing light.
However, in the above-described example of the prior art, when photographing an eye to be examined having a small pupil diameter, it is required to make the baffle and the diameter of an illuminating field stop smaller than in the ordinary case and therefore, a special condition must be set and a new operation must be added.