Patent ID: 6519093
Filing Date: 2003-02-11
Classification: G02B

Abstract:
A zoom lens system comprising a negative 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 along the optical axis; and wherein said zoom lens system satisfies the following conditions: 0.03W12âˆ’dT12)/fW<0.1 âˆ’4T/f1G<2 whereindW12 designates the distance between the most image-side surface of said first lens group and the most object-side surface of said second lens group, at the short focal length extremity; dT12 designates the distance between the most image-side surface of said first lens group and the most object-side surface of said second lens group, at the long focal length extremity; fW designates the focal length of the entire zoom lens system at the short focal length extremity; fT designates the focal length of the entire zoom lens system at the long focal length extremity; and f1G designates the focal length of said negative first lens group.