| 摘要 |
A zoom lens system comprising a first lens group having positive power and having the focusing function, a second lens group having negative power and having the magnification-varying function, a third lens group having positive power and having the magnification-varying function, and a fourth lens group having positive power and having the magnification-varying function, the zoom lens system being arranged to have a large zoom ratio, i.e., the range of field angle from 24 DEG to 62 DEG , and numerical aperture of F/4 and being arranged compactly.
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