Patent ID: 6989941

Claim:
A zoom lens comprising, 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 during zooming from the wide-angle end to the telephoto end, the first lens group moves along the optical axis toward the image side and the second lens group moves along the optical axis toward the object side; and the following conditions are satisfied: 0.5<| f 1 / f 2 |<0.8 2.6< str/z< 2.9 where f 1 is the focal length of the first lens group, f 2 is the focal length of the second lens group, str is the distance that the second lens group moves along the optical axis during zooming from the wide-angle end to the telephoto end, and z is the zoom ratio of the zoom lens, defined as the focal length at the telephoto end divided by the focal length at the wide-angle end.