| 摘要 |
A zoom lens has a field view of 60° to 70° at a wide-angle end, a magnification change ratio of about five to six times, and a small number of component lenses, enables retraction to a compact size when not in use, provides high resolution, and is compatible with a compensation function for zoom lens vibrations. Comprised are, in order from an object side, a first lens unit (G 1 ) of positive optical power, a second lens unit (G 2 ) of negative optical power, a third lens unit (G 3 ) of positive optical power, and a fourth lens unit (G 4 ) of positive optical power. When zooming from the wide-angle end to a telephoto end, the first lens unit (G 1 ) and the second lens unit (G 2 ) move so as to trace a convex path toward an image side, and the third lens unit and the fourth lens unit (G 4 ) move monotonously toward an object side.
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