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35mm format
The 35mm format, or simply 35mm, is the common name for the 36×24 mm film format or image sensor format used in photography. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43 mm. It has been employed in countless photographic applications including rangefinder cameras (film and digital), mirrorless digital cameras, digital SLRs, point-and-shoot film cameras, and disposable film cameras.
The format originated with Oskar Barnack and his introduction of the Leica camera in the 1920s. Thus it is sometimes called the Leica format or Barnack format. The name ''35mm'' originates with the total width of the 135 film, the perforated cartridge film which was the primary medium of the format prior to the invention of the full frame DSLR. The term 135 format remains in use. In digital photography, the format has come to be known as full frame, FF or FX, the latter invented as a trade mark of Nikon. Historically the 35mm format was sometimes called miniature format or small format, terms meant to distinguish the it from the middle and large formats.
== Invention ==
The 35mm format was conceived by Oskar Barnack by doubling the size of the 24×18 mm format used in cinema.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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