SMPTE ST 76 PDF

This standard specifies the dimensions required for mechanical and optical interchangeability of lenses for 16-mm and 8-mm motion-picture cameras. For 16-mm cameras with threaded lens mounts, threads having a nominal major diameter of 1 in are often specified. Similarly, for 8-mm motion-picture cameras, threads having a nominal major diameter of 5/8 in are in common use.

This standard does not apply to continuoustype motion-picture cameras because of the type of optical system employed in those cameras.