Selected papers on zoom lenses

Selected papers on zoom lenses

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The d.c. motors with permanent magnets can be run at a very low speed if the load is small and if measures are taken to ... an iris diaphragm, with servo-drive and electronic system built into the lens, and Schneider Servo modules controlling both zoom and focus controls. ... Manual operation by the cameraman is still a problem, since the zoom lens is usually well out of reach on the front of the camera.

Title:Selected papers on zoom lenses
Author:Allen Mann
Publisher:Society of Photo Optical - 1993


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