| 摘要 |
A zoom lens having at least three components, or, from front to rear, a first component of positive refractive power, a second component for variation of the image magnification, and a third component for image shift compensation, wherein said first lens component is constructed from a front group of lens elements lA of positive refractive power and a rear group of lens elements lB of negative refractive power, thereby letting fA and fB denote the focal lengths of said front and rear lens groups respectively, the following condition is satisfied: 1.5fA<¦fB¦<4fA and said rear lens group lB is made movable for focusing.
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