生活LOFT

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【Concept】
 
     In general, the use of 120 120 film camera is named.
    "120" is a standard film product number, there is no special significance, but the generation and use of numbers is closely linked with the development of the camera.
     120 cameras usually refers to medium-format camera, the size of medium-format film is 135 and 4 x 5 film's middle, so they called the medium-format
     Medium-format film there are many, previously had 120,122,127,620, etc. These numbers are not in the film as the film size classification, in fact, they are the same size, but is a different length of the film.
     Most models now only 120 films in circulation, so will be called to do with medium-format camera 120 camera
     In addition to 120, there are 220, 120 is more than twice the length of the film.

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【History  term】
 
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     1888, Kodak (Kodak) the company began producing the roll of film, and made the world's first aircraft to use a film camera, film camera was used very long, you can take pictures of a diameter of 65 mm film 100.
     The film has been pre-installed, along with a camera to photograph together after back flushing Kodak Company.
     The birth of a new type of photosensitive material, and promote the development of photographic equipment, then asked a variety of film cameras have been developed.
     1900, Brownie (Frank A.Brownell) for Kodak designed a compact box-type camera, called Brownie 号 1 (Brownell No.1). This camera uses a number of 117 film, film paper with care, loading and unloading can be performed during the day, once (can shoot 57x 57 mm screen 6, the operation is quite simple.
     1901, designed a Brownie Brownie camera on the 2nd, the screen size is 57x83 mm film compiled for the 120 number. This type of camera, was very popular. Brownie camera several improvements, has been produced to 1935.

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     The emergence of new cameras, require new specifications provide film, Kodak 101 film from 1895 began a short span of two decades have 30 numbered film products. However, some specifications of the film is not practical, will soon disappear from the market, over time, have long been forgotten.
     Germany is one of the early industrial development in the camera.
     1928, Germany Fulang Ke · Hai Deke (Fronke Heidecke) company developed a formula using the Brownie film twin-lens reflex camera, the performance is quite perfect, its photographic lens maximum aperture of 1: 4.5, focal length 75 mm, equipped Kang moved shutter speed 1-1 / 300 seconds. This is the famous Carolina FLEX (Rolleiflex) camera.
     After the camera is made to start using outdated 117 film, a film can only take pictures 6x6 cm screen 6.
     Until the second year, the required film cameras photographed 12 6x6 cm picture was produced, this is the beginning we now use 120 film.

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     120 6x9 cm film also photographed the picture 8, so this specification model B2-8 film also manufactured and sold in Germany.
     Alex Fry Carolina due to the impact of the camera, using 120 cameras will soon pop up. After all collectively use 120 film camera 120 camera.
     "120" was originally numbered Kodak film, film for national use, when the later development of international standards adopted this number, this number will be formally recognized by all countries.
     China's use of the international community usually called, and gained popularity among the masses. But some countries have their own terminologies, has retained a traditional habit.

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【Lens focal length of the term】
 
 Lens focal length 1.120 camera used with 135 cameras used are different, with 6 x 6 as an example:
     Standard lens is 80mm, equal to 135 camera 50mm.
     6 x 6 with a 50mm camera is equivalent to 135 28mm
     645 with 150mm equivalent to 135 camera 90mm.
 
 2.120 film, also known as Brownie (Brownie) type film, or B2-8-type film.
     It uses a larger area of the backsheet 120 of the film, its width is about 6 centimeters, a length of the film using a different type of camera 120 and differentiated with 4.5,6,7,9,12 even 17 cm, and therefore the camera 120 differentiated 645,66,67,69,621,617 camera.
 
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【Article is excerpted from: Web Search】
【Reserved Integrate / Just Reference】
【Translation is by The Network】