| 摘要 |
A zoom lens system comprising a negative first lens unit, a positive second lens unit, a negative third lens unit, and a positive fourth lens unit, wherein the first lens unit and the third lens unit move along an optical axis, and the fourth lens unit is fixed with respect to an image surface in zooming, the third lens unit moves along the optical axis in focusing, and the conditions: 0.0<|M3/fW|<0.5 and 0.2<|f3/f4|<1.0 (M3: an amount of movement of the third lens unit in zooming, f3: a composite focal length of the third lens unit, f4: a composite focal length of the fourth lens unit, fW: a focal length of the entire system at a wide-angle limit) are satisfied.
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