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MOTION PICTURE STANDARDS
ADOPTED IN COMMITTEE OF THE WHOLE SOCIETY
The following have been adopted as standards by the Society of Motion Picture Engineers, and are promulgated to encourage uniformity and standard practice throughout the Industry as a whole. Their early universal adoption will save the industry a great deal of present annoyance and monetary loss.
Film speed — A film movement of sixty feet per minute through motion picture mechanisms shall be considered as standard speed.
Frame line — The dividing line between pictures on motion picture film, shall lie exactly midway between the marginal perforations.
Projection angle — The maximum permissible angle in picture projection shall not exceed twelve degrees (12°) from a perpendicular to the screen surface.
Projection lens foci — The Focus of motion picture projection lenses shall increase in ^" steps to 8 inches and from 8 to 9 in ^-inch steps.
Projection lens mounting — Picture projecting lenses shall be so mounted that the light from the film picture aperture shall have an uninterrupted full path to the rear component of the lens.
Projecting lens height — The standard height from the door to the center of the projecting lens of a motion picture machine shall be 4-8 inches.
Picture aperture — The standard film picture aperture in a projecting machine shall be 0.906 inch Avide and 0.6795 inch high, namely, 29/32" and 87/128".
Film perforation — The dimensions and location of film perforation shall be in accord with the illustrating diagram herewith.