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The basic diameter is 21 mm, while it measures 30mm at the slot where the film exits. The slot is protected by a ''lightlock'' door.
It comes in lengths for 40, 25 and 15 exposures. The film surface is coated by a transparent magnetic coating, and the camera uses this ''information exchange'' (IX) system for recording information about each exposure.
The camera handles winding and rewinding automatically, to the extent that part recorded films can be removed and used later.
Processed ([[develop film|developed]]) film is stored in the original cartridge. To identify them,
every roll of APS film has a six-digit ID code on the label, which is also stored magnetically. The ID is usually printed on the back of every individual print.
To facilitate automatic processing of film, a unique [[DX number]] is assigned to the different types of film.
The format was introduced in [[1996]] by [[Kodak]], [[Agfa]], [[Fujifilm]], [[Nikon]], [[Canon]] and others. It is mainly used for compact automatic [[amateur]] cameras. The ''APS'' film surface area is 56% of [[135 film]]
Whilst APS [[Single-lens reflex camera|SLR]] cameras appeared, they were never particularly popular in the high-end amateur market who preferred to stick with their 35mm cameras.
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