Patent ID: 7283311

Claim:
A wide-angle zoom lens system comprises a positive first lens group, a negative second lens group, a positive 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 positive first lens group and said negative second lens group increases, a distance between said negative second lens group and said positive third lens group decreases, and a distance between said positive third lens group and said positive fourth lens group decreases; wherein said wide-angle zoom lens system satisfies the following conditions: 6.0< f 1 /fw< 8.0 7.0 <f 1/ |f 2|<9.0( f 2<0) 2.5 <f 3 /fw< 4.5 wherein f 1 designates the focal length of said positive first lens group; f 2 designates the focal length of said negative second lens group; f 3 designates the focal length of said positive third lens group; and fw designates the focal length of the entire wide-angle zoom lens system at the short focal length extremity.