SMPTE 231 – Motion-Picture Film (8-mm Type R) – Camera Aperture Image and Usage
This standard specifies the dimensions of the camera aperture image and its relative position to the reference edge and the perforations of 8-mm type R motion-picture film. The location of the perforations is based on dimensions given in ANSI/SMPTE 239.This standard also specifies the position of the emulsion, the frame rate, and the orientation of the area being exposed for 8-mm type R film as used in a motion-picture camera.
