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The size of the reels can vary based on the projectors, but generally films are divided and distributed in reels of up to 2,000 feet (610 metres), about 22 minutes at 24 frames/sec). Some projectors can even accommodate up to 6,000 feet (1,800 metres), which minimizes the number of changeovers (see below) in a showing.
Projection dimensions are the width and height of the projector aperture plate, and by extension the film frame area which is projected. The aperture plate always very slightly crops the frame. Projection lenses indicates whether spherical (normal) or anamorphic lenses are used on the projector, and if anamorphic lenses, what anamorphic power ...
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 projector aperture dimensions, all of which need to be defined for ...
35 mm film is a film gauge used in filmmaking, and the film standard. [1] In motion pictures that record on film, 35 mm is the most commonly used gauge. The name of the gauge is not a direct measurement, and refers to the nominal width of the 35 mm format photographic film, which consists of strips 1.377 ± 0.001 inches (34.976 ± 0.025 mm) wide.
Various dimensions were submitted, and the projector aperture plate opening size of 0.825 in × 0.600 in was agreed upon. The resulting 1.375:1 aspect ratio was then dubbed the "Academy Ratio". On May 9, 1932, the SMPE adopted the same 0.825 in × 0.600 in (21.0 mm × 15.2 mm) projector aperture standard. [4]
As a consequence, a bright line flashed onscreen when a splice was projected, and theater projectionists had been narrowing the vertical aperture to hide these flashes even before 1971. This new projector aperture size, 0.838 × 0.700 inches (21.29 × 17.78 mm), aspect ratio 1.1971…∶1, made for an un-squeezed ratio of about 2.39∶1 (43:18).