| 摘要 |
A wide-angle lens system includes a negative first lens group, and a positive second lens group, in this order from the object. The second lens group includes a positive 2F sub-lens group and a positive 2R sub-lens, in this order from the object. Upon focusing from infinity to a closer object distance, an Fa lens group constituted by the first lens group and the positive 2F sub-lens group which are arranged to move integrally, and an Fb lens group constituted by the positive 2R sub-lens group are independently moved from the image side toward the object side so that the distance between the Fa lens group and the Fb lens group are made shorter. Furthermore, the a wide-angle lens system satisfies the following conditions: <paragraph lvl="0"><in-line-formula>0.5<H1/H2R<0.9 (1) </in-line-formula><paragraph lvl="0"><in-line-formula>1.7<nPAV (2) </in-line-formula><paragraph lvl="0"><in-line-formula>0.5<Xan/Xbn<1.0 (3) </in-line-formula>
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