| 摘要 |
A zoom lens system with a vibration reducing function comprises, in the following order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, a third lens group with a positive refractive power, and a fourth lens group with a positive refractive power. The fourth lens group has a front group with a positive refractive power and a rear group with a positive refractive power. When changing a focal length of the zoom lens system from a wide-angle end to a telephoto end, the distance between the first lens group and the second lens group is increased, and the distance between the second lens group and the third lens group and the distance between the third lens group and the fourth lens group are changed nonlinearly. The front group of the fourth lens group is shiftable in a direction traversing the optical axis of the zoom lens system. The zoom lens system further comprises a drive device for shifting the front group in the direction traversing the optical axis, a detecting device for detecting vibration of the zoom lens system, and a controller for controlling the drive device based on an output from said detecting means.
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