Patent ID: 6327100
Filing Date: 2001-12-04
Classification: G02B

Abstract:
A zoom lens system comprising, in order from an object side thereof, a positive front lens group and a negative rear lens group, wherein:said positive front lens group comprises a plurality of lens groups,said negative rear lens group comprises at least one lens group,a separation between adjacent lens groups varies for zooming from a wide-angle end to a telephoto end of said zoom lens system,a separation between said front lens group and said rear lens group becomes narrow for said zooming, andsaid negative rear lens group satisfies the following conditions:0.02<.vertline.f.sub.L.vertline./f.sub.T <0.03 (I)0.1<.DELTA.X.sub.LT /f.sub.T <0.7 (II)1.5<.beta..sub.LT /.beta..sub.LW /<6 (III)where f.sub.L is a focal length of said rear lens group, f.sub.T is a focal length of said zoom lens system at said telephoto end, .DELTA.X.sub.LT is an amount, on the basis of said wide-angle end, of zooming movement of said negative rear lens group to said telephoto end, .beta..sub.LT is a transverse magnification of said negative rear lens group at said telephoto end, and .beta..sub.LW is a transverse magnification of said negative rear lens group at said wide-angle end.