Editing 8 mm film (section)

===Sound===

When Eastman Kodak first conceived the 8&nbsp;mm format, no provision was made for the addition of a sound track. Nevertheless, in the 1960s, projectors appeared on the market that were capable of recording and replaying sound from a magnetic stripe applied to the film after it had been processed. The only part of the film wide enough to accept such a magnetic stripe was the area between the edge and the perforations. A much narrower stripe was sometimes added to the opposite edge so that the film piled up evenly on the spool, but was never used for sound. The sound to picture separation was the same dimensionally as 16&nbsp;mm film, and as that format is 28 frames, that meant that the Double-8 system was 56 frames. The proximity of the sound stripe to the perforations caused some problems in keeping the film in close contact with the sound head. There was never an optical system.

A few sound prints appeared for use in Double 8 projectors.