| 摘要 |
A zoom lens which is provided with a forward unit comprising a positive lens unit and a rearward unit comprising a lens unit including a variable surface shape element the shape of at least one surface of which is variable and wherein from the wide angle end to the telephoto end, the forward unit and the rearward unit are both moved from the image surface side to the object side and at the same time, the radius of curvature of the variable surface shape element is varied, and when the power of the rearward unit at the wide angle end is phi 2 and the power of the rearward unit at the telephoto end is phi 2+ DELTA phi 2, DELTA phi 2 is negative.
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