110 is a cartridge-based film format used in still photography. It was introduced by Kodak in 1972. 110 is essentially a miniaturized version of Kodak's earlier 126 film format. Each frame is 13 mm × 17 mm (0.51 in × 0.67 in), with one registration hole. Cartridges with 12, 20, or 24 frames are available on-line. Production variations sometimes have allowed for an additional image.
The film is fully housed in a plastic cartridge, which also registers the image when the film is advanced. There is a continuous backing paper, and the frame number is visible through a window at the rear of the cartridge. The film does not need to be rewound and is very simple to load and unload. The film is usually pre-exposed with frame lines and numbers, a feature intended to make it easier and more efficient for photo finishers to print.
Unlike later competing formats, such as disc and APS film, processed 110 negatives are returned in strips, without the original cartridge.
