| 摘要 |
Zoom lens of this invention is capable of extreme closeup photography. The zoom lens has a positive power focusing lens, a negative power variator, a negative power compensator and a relay lens consisting of a movable front and a fixed rear positive power lens groups. In zooming operation, the variator is one-way shifted while the compensator is reciprocatingly shifted. In focusing, the focusing lens is shifted for an object from an infinity to a usual distance. For close-up photography the focusing lens is shifted to its extreme foremost end and the front group of the relay lens is shifted toward the image plane.
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