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A film format is a technical definition of a set of standard characteristics regarding image capture on photographic film for or film stock for filmmaking. It can also apply to projected film, either slides or movies. The primary characteristic of a film format is its size and shape.
In the case of motion picture film, the format sometimes includes audio parameters. Other characteristics usually include the film gauge, pulldown method, lens anamorphosis (or lack thereof), and film gate or movie projector aperture dimensions, all of which need to be defined for photography as well as projection, as they may differ.
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