Roll film

Roll film or rollfilm is any type of spool-wound photographic film protected from white light exposure by a paper backing. The term originated in contrast to sheet film. Roll film was originally often referred to as "cartridge" film because of its resemblance to a shotgun cartridge.

The opaque backing paper allows roll film to be loaded in daylight. It is typically printed with frame number markings that can be viewed through a small red window at the rear of the camera. A spool of roll film is usually loaded on one side of the camera and pulled across to an identical take-up spool on the other side of the shutter as exposures are made. When the roll is fully exposed, the take-up spool is removed for processing and the empty spool on which the film was originally wound is moved to the other side, becoming the take-up spool for the next roll of film.

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