Film step

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The film step is the film length offset for each phase image in the cinematographic devices of cameras, copiers, projectors, titling systems, etc. It is standardized worldwide by national and international agreements.

Overview

Normal film : 19,000 millimeters
Narrow film 16: 0.3000 "(inch) or 7.620 millimeters
Small film 9.5: 7.540 millimeters
Small film Normal-8 (Regular Eight): 0.1500 "or 3.810 millimeters
Small film Super-8 / Single 8 : one sixth of an inch (4.233 mm)
Wide film 65/70 ( Todd-AO ): 23.750 millimeters; also 71.25 millimeters (IMAX) and 38 millimeters

The hole spacing in the film perforation is not to be confused with the film step, because there are different dimensions for special technical requirements. Image recording materials are generally perforated with a hole spacing that is 2 per thousand smaller, so that the resulting original matches the geometry of gear-wheel copiers when copying.

In addition to the normal film step, one speaks of the half film step, for example at Techniscope , and of the three-hole step, casually also “ two-perf. (oration hole step) ”,“ Three perf. "Etc.

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  • ISO 23: 1993 "Cinematography - Camera usage of 35 mm motion-picture film - Specifications".
  • ISO 491: 2002 "Cinematography - Raw cinema film and 35 mm magnetic film - Cutting and perforation dimensions"