It has the same dimensions and perforation pitch as 35 mm movie print film (also called "long pitch", KS-1870, whereas 35 mm professional motion picture camera films are always "short pitch", BH-1866). The end of the film is cut on one side to form a leader. The film is clipped or taped to a spool and exits via a slot lined with flocking. Individual rolls of 135 film are enclosed in single-spool, light-tight, metal cassettes to allow cameras to be loaded in daylight. Even though the format is much smaller than historical medium format and large format film, being historically referred to as miniature format or small format, it is much larger than image sensors in most compact cameras and smart phone cameras. The size of the 135 film frame with its aspect ratio of 1:1.50 has been adopted by many high-end digital single-lens reflex and digital mirrorless cameras, commonly referred to as " full frame". Despite competition from formats such as 828, 126, 110, and APS, it remains the most popular film size today. It quickly grew in popularity, surpassing 120 film by the late 1960s to become the most popular photographic film size. The term 135 was introduced by Kodak in 1934 as a designation for 35 mm film specifically for still photography, perforated with Kodak Standard perforations. The engineering standard for this film is controlled by ISO 1007 titled '135-size film and magazine'. It is a film with a film gauge of 35 mm (1.4 in) loaded into a standardized type of magazine – also referred to as a cassette or cartridge – for use in 135 film cameras. Leica I, 1927, the first successful camera worldwide for 35 cine filmġ35 film, more popularly referred to as 35 mm film or 35 mm, is a format of photographic film used for still photography.
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