Patent ID: 6169635
Filing Date: 2001-01-02
Classification: G02B

Abstract:
A zoom lens system, comprising: a negative first lens group that is movable along an optical axis for zooming, said negative first lens group being a closest lens group to an object, of any lens group of said zoom lens system; a positive second lens group that is movable along said optical axis for zooming, said positive second lens group being positioned at an image side of said first negative lens group; and an aperture stop that is an only element positioned between said first and second lens groups, said aperture stop being fixedly positioned during zooming, wherein the zoom lens system satisfies following relationships: 0.7<(f.sub.i -f.sub.w)/(f.sub.t -f.sub.w)<1.0 0.37<d.sub.i /f.sub.w 0.3<f/f2<0.7 where f.sub.1 is a focal length of the entire zoom lens system when the total length of the entire zoom lens system becomes shortest, f.sub.w is the shortest focal length of the entire zoom lens system, f.sub.t is the longest focal length of the entire zoom lens system, d.sub.i is an air gap along the optical axis between the first lens group and the aperture stop when the total length becomes shortest, and f.sub.2 is focal length of the second lens group.