| 35 mm film is a photographic stock which is 35 millimeters (about 1 3/8 inches) wide in rolls of from about 2 feet to about 1000 feet in length. Customarily it is perforated along one or both edges. After the introduction of sound motion pictures the sound track was printed along one edge. The film was introduced experimentally in the 1880s. It was used for the earliest movie film in the 1890s. When Leica "miniature" camera was introduced in 1925, it very rapidly became a popular stock for still photographs. From the 1950s onward it was the usual size for photo-journalists and serious amateurs. Generally the image size is 30mm wide by 24mm high, the 4x5 ratio which was long used and accepted. The film was also used for slides after Kodachrome was introduced in 1935. stereo slides split the image area into two halves.
The film was also used for microfilming starting about 1927. Estimated basic value: values vary greatly
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