Film perforations

（重定向自Film perforation）

Perforations on Standard (left) and Super (right) 8 mm film

The shapes and dimensions of 35 mm sprocket holes.

Film perforations, also known as perfs, are the holes placed in the film stock during manufacturing and used for transporting (by sprockets and claws) and steadying (by pin registration) the film. Films may have different types of perforations depending on film gauge, film format, and intended usage. Perforations are also used as a standard measuring reference within certain camera systems to refer to the size of the frame.

单词	Film perforation
释义	Film perforation 英语百科 Film perforations （重定向自Film perforation） Film perforations, also known as perfs, are the holes placed in the film stock during manufacturing and used for transporting (by sprockets and claws) and steadying (by pin registration) the film. Films may have different types of perforations depending on film gauge, film format, and intended usage. Perforations are also used as a standard measuring reference within certain camera systems to refer to the size of the frame.
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