Patent ID: 8665529

Claim:
A zoom lens, comprising, in order from an object side: a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having positive refractive power, wherein the zoom lens satisfies the following conditions: DG 1 /fw>0.72; DG 2 /fw<0.72; Wide Fno<2.8; and TTL<15 mm, wherein, fw is a focal length of the zoom lens at a wide-angle end, DG 1 is a thickness of the first lens group, DG 2 is a thickness of the second lens group, “Wide Fno” denotes the F-number of the zoom lens at the wide-angle end, and TTL is a distance between the object side of the first lens group and an image-forming plane of the zoom lens.