Patent ID: 7142372

Claim:
A zoom lens system comprising a negative first lens group which is stationary or movable, a positive second lens group which is movable, and a positive third lens group which is movable, 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; and wherein said zoom lens system satisfies the following conditions: 0.3< fw/|f 1 |<0.65( f 1<0) 0.6< fw/f 2 <1.2 0.3< fw/f 3 <0.6 wherein fw designates the focal length of the entire zoom lens system at the short focal length extremity; and f i designates the focal length of the i th lens group (i=1, 2, 3).