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I was a motion picture cameraman. Film speed standard was 24 frames per second. That isn't fast enough to eliminate flicker so each frame was projected twice by a butterfly shutter. High speed 16mm motion picture camera with pull down claw film advance and registration pin holding film during exposure were limited to 400 fps but using rotating glass shutter much faster frame rate is possible. I,000 fps +, because film didn't need to stop for each frame exposure.
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