| 摘要 |
The invention is concerned with a high-zoom-ratio, high-performance zoom lens that is much more improved in compactness. The zoom lens comprises a first lens group G 1 of positive refracting power, a second lens group G 2 of negative refracting power, a third lens group G 3 of positive refracting power and a fourth lens group G 4 of positive refracting power, with a varying space between adjacent lenses during zooming. Upon zooming from the wide-angle end to the telephoto end of the zoom lens system, the first lens group G 1 is positioned nearer to the object side at the telephoto end than at the wide-angle end. The zoom lens of the invention satisfies a specific condition for properly defining the refracting power of the first lens group and a specific condition for defining the transverse magnification of the second lens group.
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