Patent ID: 6813090
Filing Date: 2004-11-02
Classification: G02B

Abstract:
A zoom lens system comprising a positive first lens group, a positive second lens group, and a negative third lens group, in this order from an object,wherein zooming is performed by moving said first, second and third lens groups in the optical axis direction; wherein said positive first lens group comprises a negative lens element and a positive lens element, in this order from said object; wherein said negative third lens group comprises a positive lens element, a negative lens element and a positive lens element, in this order from said object; and wherein said zoom lens system satisfies the following condition: 0.152G/fW<0.28 wherein&Sgr;d2G designates the distance from the most object-side surface of said positive second lens group to the most image-side surface thereof; and fW designates the focal length of the entire zoom lens system at the short focal length extremity.