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
Kodak Stereo Camera photography. The film counter was the countdown type, which would be manually set when film was loaded according to how many pairs the roll could take. The number 20 was in red and there were red marks at 15 and 28, for use with standard 20 and 36 exposure rolls of film. A properly loaded 24 exposure roll of film will give 18 stereo pairs, but there is no special marking as 24 exposure rolls of film were not standard at the time the camera was produced. Opposite the counter was another manually set dial which indicated whether the cameras