| 摘要 |
A zoom lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power and a fourth lens group having positive refractive power, the zoom lens system being arranged to be zoomed by moving the second and third lens groups, at least one lens element in the fourth lens group being arranged as a plastic lens, the zoom lens system being thereby arranged to be small in size, light in weight and low in price and, at the same time, to have high performance.
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