Patent ID: 7016119

Claim:
A zoom lens system comprising a negative first lens group, a positive second lens group, and a positive third lens group, in this order from an object, wherein upon zooming from the short focal length extremity to the long focal length extremity, a distance between said negative first lens group and said positive second lens group decreases, and a distance between said positive second lens group and said positive third lens group increases; wherein when zooming is being performed, said positive third lens group remains stationary, and said negative first lens group and said positive second lens group are moveable along the optical axis of said zoom lens system; and wherein said zoom lens system satisfies the following conditions: 3.0 <f 3 /f 2 <3.5 1.4 <|f 1 /f W |<2.0 0.8 <f 2 /f W <1.5 wherein f 1 designates the focal length of said negative first lens group; f 2 designates the focal length of said positive second lens group; f 3 designates the focal length of said positive third lens group; and f W designates the focal length of the entire zoom lens system at the short focal length extremity.