1. A lens optical system in which optical beams are incident at view angles divided into a plurality of equal angles by a mobile camera, comprising: an optical lens in which one pair of incident surfaces corresponding to the divided view angles are adjacently arranged at the center portion, optical beams incident at the divided view angles being transmitted through respective off-axis lens systems; and one pair of image sensors separately arranged under both lower portions of the optical lens to receive the optical beams transmitted through the off-axis lens systems, wherein the pair of image sensors includes an image sensor having a green light receiving region where only a green color is received, and an other image sensor having a mixed light receiving region where red and blue colors are alternately mixed.