Patent ID: 8786956

Claim:
A zoom lens system comprising, from an object side, a first lens group having a negative optical power, a second lens group having a positive optical power, a third lens group having a negative optical power, and a fourth lens group having a positive optical power, the zoom lens system achieving zooming by varying distances between the lens groups, wherein during zooming, at least the first to third lens groups move individually, during zooming from a wide-angle end to a telephoto end, the distance between the first and second lens groups decreases, the distance between the second and third lens groups varies, and the distance between the third and fourth lens groups increases, and Conditional Formulae (1) and (2) below are fulfilled: 1.0 ≦|f 2/ f 1|≦1.5 (1) 2.0 ≦|f 4/ f 1|≦5.0 (2) where f1 represents a focal length of the first lens group; f2 represents a focal length of the second lens group; and f4 represents a focal length of the fourth lens group.