The term 35 mm camera usually refers to a still photographic film camera which uses the 35 mm format on 135 film. The 35 mm format, or simply 35 mm, originated with Oskar Barnack and his introduction of the Leica camera in the 1920s. It has an aspect ratio of 3:2 and it has been employed in countless photographic applications including single-lens reflex (SLR) cameras, mirrorless interchangeable-lens digital cameras, point-and-shoot film cameras, rangefinder cameras (film and digital), digital SLRs, and disposable film cameras. Some notable 35 mm camera systems are the original Leica, Leica M, Leica R, Canon EOS, Canon FD, Nikon F, Argus C3, Minolta OM and the Pentax K-mount system.
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