Film base
The film base as a measure of length always denotes a whole number of phase images on motion picture film , ignoring the geometric or true length of the piece of film. Shrunk film can also be discussed with film footer information.
Working with whole numbers helps avoid errors that can arise when converting between metric measures and those of the imperial system.
The dimensioning of the cinema films took place in France and in the Anglo-Saxon area. The decisive factor was the spread of the film format created by Dickson with the kinetoscope . The foot originally used was replaced by a metric measure in 1909. For 16 mm, 8 mm and Super 8 film, the length and footprint are identical (0.3048 meters).
A foot of normal film has 64 hole spacings and contains 16 frames with normal film pitch .
A foot of 16 mm film and a foot of 9.5 mm film contain 40 frames.
One foot of 8 mm film contains 80 frames.
One foot of Super 8 or Single 8 film contains 72 frames.
Five foot wide film , Todd-AO aspect ratio, contains 64 frames.
Further useful information about normal film:
- At 16 km / h, the material consumption is 60 feet per minute.
- At 24 km / h, material consumption is 90 feet per minute.
- Cine film consumption at 24 speed: 36 feet per minute
- 100 minutes of sound film equals 9,000 feet (35) and 3,600 feet (16 and 9.5), respectively; 1800 feet (8 mm), 2000 feet (8-S).
- Cine film consumption at 24 speed: 36 feet per minute
- ISO 491; 35 mm motion picture and magnetic film, dimensions for cutting and perforation, dimension B ( hole spacing )
- ISO 69; 16 mm raw film, dimensions for cutting and perforation, dimension B ( hole spacing )
- ISO 3023; 65 and 70 mm raw cinema film, dimensions for cutting and perforation, dimension B ( hole spacing )