Patent ID: 7538954

Claim:
A zoom lens system comprises 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, all of said negative first lens group, said positive second lens group and said positive third lens groups are arranged to move in the optical axis direction; wherein said negative first lens group comprises a negative lens element, a negative lens element and a positive lens element, in this order from the object; wherein said positive second lens group comprises a positive lens element, a positive lens element, a negative lens element, and a positive lens element, in this order from the object; and wherein said zoom lens system satisfies the following condition: 1.2<| f 1G |/f 2G <1.5 wherein f 1G designates the focal length of said negative first lens group (f 1G <0); and f 2G designates the focal length of said positive second lens group.