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500 NEW AMERICAN STANDARDS April
American Standard
Location and Size of Picture Aperture of 16-Millimeter Motion Picture Projectors
Of.
Z22.8-1950
Revijion of Z22.8-1941
and
Z22.14-1941 •UDC 778.55
Page 3 of 3 pages
sound-track edge without encroaching on, and consequently scratching, the picture or sound-track area. (See Section 3, Proposals for 1 6-mm. and 8-mm. Sproket Standards, Vol. 48, No. 6, June 1 947, Journal of the Society of Motion Picture Engineers).
The film may be pressed against the fixed edge guide by a spring, by the tendency of the film to tilt in the gate, or by other means. In the second case, there is a fixed guide for each edge of the film. The important point is to have the film centered laterally on the optical axis.
Dimension C is made slightly less than half the width of unshrunk film so that the film will be laterally centered if it has a slight shrinkage at the time it is run in the projector. This is the normal condition. As indicated by the above discussion, C may be measured in either direction from the vertical centerline.
Note 4: The K dimensions are measured along the path of the film from the horizontal centerline of the aperture to the stopping position of the registration device. It is customary to provide a framing movement of 0.025 inch above and below this nominal position. For any given projector, use the value of K corresponding to the location of the registration device.
If the film does not stop exactly where the film registration device leaves it, because of coasting or some other cause, a slight adjustment of the value of K will be necessary.
Note 5: "Optical axis of projector" is defined as the mechanical axis or centerline of the sleeve for holding the projection lens. Except for manufacturing tolerances it coincides with the lens axis.