Patent ID: 6324017
Filing Date: 2001-11-27
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 upon zooming, said first, second and third lens groups independently move along the optical axis of said zoom lens system; andwherein said first and second lens groups, which move independently upon zooming, move integrally along the optical axis upon focusing, wherein said zoom lens system satisfies the following condition:1<f.sub.FT /f.sub.FW <1.5whereinf.sub.FT designates the resultant focal length of said first lens group and said second lens group at the long focal length extremity; andf.sub.FW designates the resultant focal length of said first lens group and said second lens group at the short focal length extremity.