ISO 6033:1983

The size 7 reel descirbed here has a nominal film capacity of 15 m and is generally used for returning the film from the processing laboratory. It is considered to be interchangeable in all models of 8 mm projection cassettes (encapsulated devices) of type S which take up reels with a maximum outside flange diameter of 75 mm. This type of reel also fits normal reel-to-reel projection equipment.