Patent ID: 6333823
Filing Date: 2001-12-25
Classification: G02B,Y10S

Abstract:
A zoom lens system comprising a plurality of lens groups, wherein a deflector, which deflects an optical axis of said zoom lens system, is positioned between first and second lens groups which are movable for zooming, said zoom lens system comprising a lens positioned at an image side of said second movable lens group,wherein said zoom lens system satisfies the following conditions:0<log.sub.10 Z.sub.2 /log.sub.10 Z<0.40.2<f.sub.w /f.sub.(3-4)w <0.6-1.3<m.sub.3t <-0.8whereinZ.sub.2 =m.sub.2t /m.sub.2w ;Z=f.sub.t /f.sub.w ;m.sub.2t designates the transverse magnification of said second lens group at the long focal length extremity;m.sub.2w designates the transverse magnification of said second lens group at the short focal length extremity;f.sub.t designates the focal length of the entire lens system at the long focal length extremity;f.sub.w designates the focal length of the entire lens system at the short focal length extremity;f.sub.3-4)w designates the resultant focal length of said second movable lens group and the lens positioned at an image side of said second movable lens group at the short focal length extremity; andm.sub.3t designates the transverse magnification of said third lens group at the long focal length extremity.