| 摘要 |
A wide-angle 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, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the negative first lens group and the positive second lens group decreases, a distance between the positive second lens group and the negative third lens group increases, and a distance between the negative third lens group and the positive fourth lens group decreases. The wide-angle zoom lens system satisfies the following conditions: <?in-line-formulae description="In-line Formulae" end="lead"?>1.6<X2/fw3.5 . . . (1); 1.2<|f1|/fw<2.0 (f1<0) . . . (2); and 1.6<f2/fw<2.7 . . . (3).<?in-line-formulae description="In-line Formulae" end="tail"?>
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