a comprehensive fisheye lenses knowledge base
Same 1″ (25.4 mm) in diameter with 32 threads per inch, but shorter flange focal distance (12.526 millimeters) than C-Mount. Born for 8mm and 16mm film movie cameras, and 1/3″, 1/2″, 2/3″, 1″, and 4/3″ video formats, image circle from 5 to 22 mm.
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