| 摘要 |
The invention provides a four-unit type of zoom lens system which is of compact size albeit having a high zoom ratio, and comprises a first unit G1 of positive refracting power, a second unit G2 of positive refracting power, a third unit G3 of negative refracting power, and a fourth unit G4 of negative refracting power, wherein the spaces between the units vary during zooming, said zoom lens system being characterized in that all these units are moved toward the object side for zooming from the wide-angle to telephoto end.
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