ST 173:2004 - SMPTE Standard - For Motion-Picture Equipment (8-mm Type R) — Double 8-mm Camera Spools — 100-Ft Capacity

The dimensions shown in this standard are for double 8-mm type R motion-picture film spools with a nominal capacity of 100 ft (30 m). These spools are used in cameras of the type in which each roll of film is passed through the camera twice for exposure in accordance with SMPTE 231. The spindle holes in the spool are shown with splines which are intended to assist in ensuring correct orientation of the spool in the camera.