| 摘要 |
A zoom lens having a semi-field angle of between 12.6 DEG and 6.3 DEG capable of focusing at a 1:2 image-to-object distance ratio while providing a comfortable working range. The lens comprises a movable focusing group, a second stationary compensating group, two zooming groups which move axially relative to the lens and differentially of each other, and a fifth rear master group.
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