| 摘要 |
A zoom lens comprising, in order from an object side to an image side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power, and a fourth lens unit of a positive refractive power. In zooming, the first lens unit is configured fixed and the second, third, and fourth lens units are configured movable. The following conditions are satisfied where f3st is a movement amount of the third lens unit associated with zooming from a wide angle end to a telephoto end, f3 is a focal length of the third lens unit, &bgr;2w is a lateral magnification of the second lens unit at the wide angle end, and z is a zoom ratio, 0.010<(|f3st|/f3)/z<0.045, and −0.33<&bgr;2w<−0.20.
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