| 摘要 |
A compact zoom lens comprises, from front to rear, a first lens unit for focusing having a positive refractive power, a second lens unit having a negative refractive power and axially movable for varying the image magnification, a third lens unit axially movable for compensating for the shift of an image plane resulting from the variation of the image magnification, and a fourth lens unit of positive refractive power having an image forming function which remains stationary relative to a focal plane. The fourth lens unit includes, from front to rear, a first lens of positive refractive power, a second lens of negative refractive power, a third lens of negative refractive power, a fourth lens of positive refractive power and a fifth lens of positive refractive power. And, in particular, a stop for determining the F-number is arranged in a space between the second and third lens units.
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