| 摘要 |
A compact zoom lens includes a first lens group ( 1, 3 ) of negative refractive power disposed on an object side and a second lens group ( 2, 4 ) of positive refractive power disposed on an image side. Both the first and second lens groups are movable. The first lens group and the object side defines a first variable distance therebetween, and the first and second lens groups defines a second variable distance therebetween. During zooming from the telephoto end to the wide-angle end, the second lens group moves toward the image side and the second variable distance decreases. The compact zoom lens has a long back focal length with various aberrations satisfactorily corrected.
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