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Perfs

(Redirected From Sprocket Holes)

From Chace Audio

Perfs, short for perforations, are the punched holes found on the edges of film stock. Teeth-like sprockets from cameras and projectors grab the perforations to guide film safely through machines at a constant speed. Depending on the format of the film stock (e.g., 35mm, 17.5mm, 16mm, etc.) the perfs will vary in their size, shape, number per frame, and in whether or not they are on both sides of the frame.

The perforations are the holes on one or either side of film stock.

35mmfilm.jpg