Patent ID: 8254040

Claim:
A super-wide-angle lens system for imaging an object on an imaging surface, comprising: a first lens group with negative refraction power comprising, in the order from the object side to the image side thereof, a first spherical lens with negative refraction power, a second spherical lens with negative refraction power, and the third spherical lens with positive refraction power, the first spherical lens having a first surface facing the object side of the first lens group; a second lens group with positive refraction power comprising, in the order from the object side to the image side thereof, a fourth spherical lens with positive reflection power and a fifth spherical lens with negative reflection power; and wherein the super-wide-angle lens system satisfies the formulas: 0.01< D/|FG 1|<1; and (1) 2< D/FG 2<4; (2) where D is the distance from the first surface to the imaging surface along the optical axis of the lens system, FG1 is the effective focal length of the first lens group, and FG2 is the effective focal length of the second lens group.