| 摘要 |
The zoom lens which is compact and has high optical performance over the entire zoom range includes in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. Distances between the first to third lens units are varied during zooming. The second lens unit includes a lens element whose image side surface has a concave shape, a most object side positive lens element and a most image side positive lens element. Conditions of 0.4<d2a/D2<0.7, 0.5<f21/f2<1.3 and 3.2<(&bgr;2T·&bgr;3W)/(&bgr;2W·&bgr;3T)<5.0 are satisfied.
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