Patent ID: 7589907

Claim:
A zoom lens system comprising, in order from an object side: a first lens group having a negative optical power, a second lens group having a negative optical power, and, a third lens group having a positive optical power, wherein the position of the first lens group is fixed during zooming, and the third lens group comprises three single lenses including, in order from the object side, a third-first lens being a single lens having a positive optical power, a third-second lens being a single lens having a negative optical power and a third-third lens being a single lens having a positive optical power, and wherein the following conditional expression (1) is satisfied: 0.35 <L 3 /f 3<1.5 (1) where L 3 represents the axial air gap distance between the third-second lens and the third-third lens and f 3 represents the focal length of the third lens group.