发明名称 Zoom lens system and image pickup apparatus including the same
摘要 A zoom lens system includes a frontmost first lens unit having a negative optical power and a plurality of lens units on the rear side thereof. The first lens unit consists of a negative lens element. The zoom lens system includes five or less lens elements in total. The Abbe number of the negative lens element and the exit pupil distance of the zoom lens system at a wide-angle end are appropriately adjusted.
申请公布号 US7221519(B2) 申请公布日期 2007.05.22
申请号 US20060445068 申请日期 2006.05.31
申请人 CANON KABUSHIKI KAISHA 发明人 YASUI HIROTO
分类号 G02B15/14 主分类号 G02B15/14
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