Patent ID: 6545820
Filing Date: 2003-04-08
Classification: G02B

Abstract:
A zoom lens system comprising a positive first lens group, and a negative second lens group, in this order from an object,wherein zooming is performed by varying the distance between said first lens group and said second lens group; wherein said first lens group comprises a negative first sub lens group and a positive second sub lens group, in this order from said object; and wherein said zoom lens system satisfies the following conditions: 5.01<7.0 0.91a|<1.8 â€ƒwherein ft designates the focal length of the entire zoom lens system at the long focal length extremity; f1 designates the focal length of said first lens group; fw designates the focal length of the entire zoom lens system at the short focal length extremity; and f1a designates the focal length of said first sub lens group of said first lens group.