8 mm film is a motion picture film format in which the filmstrip is eight millimeters wide. It exists in two main versions: the original standard 8 mm film,
also known as regular 8 mm or Double 8 mm, and Super 8. Although both standard 8 mm and Super 8 are 8 mm wide, Super 8 has a larger image area because of its smaller
and more widely spaced perforations.
There are also two other varieties of Super 8 - Single 8 mm and Straight-8 - which require different cameras but which produce a final film with the same dimensions.
The picture area of standard 16 mm is 10.26 mm by 7.49 mm, an aspect ratio of 1.37:1, the standard pre-widescreen Academy ratio for 35 mm. Double-perf 16 mm film, the original format,
has a perforation at both sides of every frame line. Single-perf is perforated at one side only, making room for an optical or magnetic soundtrack along the other side.