| 摘要 |
A movie camera is shown with a zoom lens capable of automatic focus by movement of the lens system closest to the camera body instead of the front objective. As a result the system is more efficient because the heavy large front objective is fixed during automatic focusing and the focusing system need only move a smaller lens or group of lenses which are closer to the camera body. The variator, the compensator, the fourth lens group or any combination of them can be adjusted for automatic focusing.
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