Academy ratio

35mm film showing the Academy ratio in green, with the shorter 1.66:1 and 1.85:1 ratios shown inside
Academy ratio 1.375:1

The Academy ratio of 1.375:1 (abbreviated as 1.37:1) is an aspect ratio of a frame of 35 mm film when used with 4-perf pulldown. It was standardized by the Academy of Motion Picture Arts and Sciences as the standard film aspect ratio in 1932, although similar-sized ratios were used as early as 1928.

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