SMPTE 86 – Motion-Picture Film – Magnetic Audio Records – Two, Three, Four and Six Records on 35-mm and One Record on 17.5-mm Magnetic Film
This standard specifies the position, dimensions, reproducing speed, and identity of the two-, three-, four-, or six-track magnetic audio records on 35-mm magnetic film, and one single-track record on 17.5-mm magnetic film. It also specifies the assignment of records to the various tracks on the magnetic coating on the film in relation to the direction of film travel.
