Camera sensitive photographic materials became available, cameras began to incorporate mechanical shutter mechanisms that allowed very short and accurately timed exposures to be made. The use of photographic film was pioneered by George Eastman, who started manufacturing paper film in 1885 before switching to celluloid in 1889. His first camera, which he called the "Kodak," was first offered for sale in 1888. It was a very simple box camera with a fixed-focus lens and single shutter speed, which along with its relatively low price appealed to the average consumer. The Kodak came pre-loaded with enough film for 100 exposures and needed
Mitchell Camera effects process plates, or for high-speed filming. In a few cases, the U.S.S.R. added spinning mirror-shutter reflex focusing and viewing, thereby deleting the Mitchell-designed rackover focusing mechanism and the Mitchell-designed side viewer. Though the Eastern Bloc standard for camera film is Kodak Standard perforations, that standard was rejected by the very Bloc which proposed it. U.S.S.R. professional cameras consequently require film stocks that are incompatible with Western Bloc camera film, which always uses Bell & Howell perforations. Eastern Bloc (KS) camera film "will" pass undamaged through a Western Bloc (BH) professional camera, but the images "will not" be registered accurately.