Patent ID: 6917477

Claim:
A zoom lens formed of only two lens groups, arranged along an optical axis in order from the object side as follows: a first lens group having negative refractive power; and a second lens group having positive refractive power; wherein the first and second lens groups are moved along the optical axis during zooming, and the following conditions are satisfied: −3.4 <fl/fw<− 3.0 −1.6 <MT<− 1.4 60 <v ( G 2 +) where fl is the focal length of the first lens group, fw is the focal length of the two-group zoom lens at the wide-angle end, MT is the lateral magnification of the second lens group at the telephoto end of the zoom range of the two-group zoom lens, and v(G 2 +) is the average of the Abbe numbers of the materials of the lens elements having positive refractive power of the second lens group.