| 摘要 |
A zoom lens, including, in order from an object side to an image side (a) a first lens unit of negative optical power, (b) a second lens unit of positive optical power, and (c) a third lens unit of positive optical power, wherein a separation between the first lens unit and the second lens unit and a separation between the second lens unit and the third lens unit are varied to effect variation of magnification, and wherein the zoom lens satisfies the following conditions: ndp 3 <1.5 and vdp 3 >70.0, where ndp 3 and vdp 3 are a refractive index and Abbe number, respectively, of material of the positive lens in the third lens unit.
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