Patent ID: 8237842

Claim:
A wide-angle lens consisting of, in order from an object side: a front lens group consisting of a first front lens group that consists of a negative meniscus lens having a concave surface facing an image side, a second front lens group that consists of a negative lens having a concave surface facing the image side, and a third front lens group that has a convex surface facing the object side and has positive refractive power; and a rear lens group consisting of a first rear lens group that consists of a cemented lens constructed by, in order from the object side, a negative lens cemented with a positive lens and has positive refractive power as a whole, and a second rear lens group having positive refractive power; and the following conditional expressions being satisfied: 0.741 ≦f 2 /f 1<1.95 −0.36 <f 12 /f 6<−0.21 −1.38 <f 12 /f<− 0.95 3.50 <f 6 /f< 5.20 where f denotes a focal length of the wide-angle lens, f 1 denotes a focal length of the first front lens group, f 2 denotes a focal length of the second front lens group, f 12 denotes a combined focal length of the first front lens group and the second front lens group, and f 6 denotes a focal length of the second rear lens group.