Film photography is divided into three main categories : 35mm, medium format and large format photography. 35mm photography employs common Nikon, Minolta and Canon cameras. The film is approximately 36 by 24mm in dimension.
The next larger size of film is the medium format film, which is 6.5 cm wide. It comes in rolls, and is available in 2 lengths – 120 and 220. The two lengths represent different length of film, much like the 24-exposures and 36-exposures type of 35mm film.
Large format films comes in sheet form, rather than in rolls. They are used mainly by professionals, because of the extreme care it takes to load and handle the film and camera. It comes in two sizes – 4 x 5 inches and 8 x 10 inches.