Patent ID: 7248416

Claim:
A wide-angle zoom lens system comprises a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth 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, a distance between said positive second lens group and said negative third lens group increases, and a distance between said negative third lens group and said positive fourth lens group decreases; wherein said wide-angle zoom lens system satisfies the following conditions: 1.3<| f 1|/ fw< 1.7 ( f 1<0) 2.5 <f 4/ fw< 3.3 wherein f 1 designates the focal length of said negative first lens group; f 4 designates the focal length of said positive fourth lens group; and fw designates the focal length of the entire wide-angle zoom lens system at the short focal length extremity.