| 摘要 |
An embodiment of this invention provides a zoom lens, which includes, in order from an object side to an image-forming side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power, wherein the second lens group, the fourth lens group, and the fifth lens group are moving with respect to one another, for zooming from a wide-angle end to a telephoto end thereof.
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