| 摘要 |
A zoom lens includes a negative first group disposed on the enlarging side and comprising, in succession from the enlarging side, a negative first lens whose reducing side surface has a sharper curvature than the enlarging side surface, a positive second lens whose enlarging side surface has a sharper curvature than the reducing side surface, and a negative third lens, and a positive second group disposed on the reducing side. The spacing between the first group and the second group is variable to accomplish a magnification change.
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