| 摘要 |
A zoom lens system includes, in order from an object side: a first lens group having negative power, a second lens group having negative power, a third lens group having positive power, and, a fourth lens group having positive power. The position of the first lens group is fixed during zooming, and the third lens group includes three single lenses including, in order from the object side, a third-first single lens having positive power, a third-second single lens having negative power and a third-third single lens having negative power. The zoom lens system satisfies the following conditional expression: <?in-line-formulae description="In-line Formulae" end="lead"?>0.4<L3/fw<1.2<?in-line-formulae description="In-line Formulae" end="tail"?> where L3 represents the axial air gap distance between the third-second lens and the third-third lens and fw represents the focal length of the entire system of the zoom lens system at a wide angle end position.
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