Patent ID: 8107174

Claim:
A wide-angle lens comprising, in order from an object side: a first lens group having negative refractive power; and a second lens group having positive refractive power; the first lens group including at least one negative meniscus lens having a convex surface facing the object side, the second lens group including, in order from the object side, a positive lens, a negative lens, and a positive lens, and the following conditional expressions being satisfied: 0.90 <Σd/Y max<2.00 1.30 <BF/f 0<2.50 where Σd denotes a distance along an optical axis between the most object side lens surface and the most image side lens surface of the wide-angle lens, Ymax denotes an image height with respect to the maximum angle of view of the wide-angle lens, BF denotes a distance between the vertex of the most image side lens surface and the paraxial focal plane of the wide-angle lens, and f 0 denotes a focal length of the wide-angle lens upon focusing on infinity.