Journal of the Society of Motion Picture Engineers (1930-1949)

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582 MULLER November 5000 20 30 40 50 60 FEET OF FILM -16 MM 70 80 90 100 Fig. 4— Relation between frames per second and exposed film. being accurately related to one cycle of the standard 60-cycle current. To give you an idea of the exposure time involved, it may be stated that of the l/\ millisecond or 250 microseconds between frames, approximately 80 microseconds are used for exposure, the rest for film transit. Fig. 5 — General camera setup.