How to determine if your film was shot at 18 or 24 frames per second

Most Normal-8 films were shot at 16 frames per second, and most Super-8 films were shot at 18 frames per second.

Very few films were shot at 24 frames per second (fps) and usually only a trained projectionist can determine the speed at which a film was shot.

Film shot at 24 fps produced smoother looking camera movements. It should have been the preferred speed to shoot at, but there was the cost factor. It used up film more quickly!