Before the era of sound movies the frame rates for silent films varied considerably due to the hand-cranked cameras of the time. When picture and sound became the future of movies in the late 1920s, however, the industry settled on 24Hz (24 frames per second) for both production and display standards. But 24fps alone would have produced significant jitter. For acceptably smooth motion, each film frame was flashed on the screen twice, using a two-bladed shutter in the projector (or, more rarely, three times with a triple blade shutter). This rate was also chosen, rather than an even higher one, to keep film costs manageable.
Even though the digital bits that now convey our films from the studio to the screen are far cheaper than celluloid, 24fps still dominates the films we see in both the multiplex and at home. But occasional efforts have tried to break the mold...
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