公开(公告)号：US20030086181A1

公开(公告)日：2003-05-08

申请号：US10281357

申请日：2002-10-28

Applicant: PENTAX CORPORATION

Inventor： Masayuki Murata

IPC: G02B015/14

CPC classification number: G02B15/177

Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group, and satisfies the following conditions: 0.25

Abstract translation: 变焦透镜系统包括负第一透镜组，正第二透镜组，负第三透镜组和正第四透镜组，并且满足以下条件：0.25 <| f3 / ft | <0.5（1）0.07 < log（Z34）/ log（Z）<0.17（2）-0.17