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120 is a popular film format for still photography introduced by Kodak for their Brownie No. 2 in 1901. It was originally intended for amateur photography but was later superseded in this role by 135 film. 120 film and its close relative, 220 film, survive to this day as the only medium format films that are readily available to both professionals and amateur enthusiasts.
The 120 format is a roll film, 60mm wide. The film is held in an open spool originally made of wood with metal flanges, later all metal, and finally plastic. The length of film is typically 30 inches (76 cm) up to 32–33 inches (81–84 cm), attached to a piece of backing paper longer and slightly wider than the film. The backing paper protects the film while it is wound on the spool, with enough extra length to allow loading and unloading the roll in daylight without exposing any of the film. Frame number markings for the three standard image formats (6×4.5, 6×6, and 6×9; see below) are printed on the backing paper.
The 220 format was introduced in 1965 and is the same width as 120 film, but with about double the length of film and thus twice the number of possible exposures per roll. Unlike 120 film, however, there is no backing paper behind the film itself, just a leader and a trailer. This results in a longer film on the same spool, but there are no printed frame numbers. Moreover, it cannot be used in unmodified old cameras that have a red window as frame indicator. Also, since the film alone is thinner than a film with a backing paper, a special pressure plate may be required to achieve optimal focus if the film is registered against its back side. Some cameras capable of using both 120 and 220 film will have a two position adjustment of the pressure plate (e.g. the Mamiya C220 or Mamiya C330) while others will require different film backs e.g. the Pentax 645 or Kowa Six).
Frame sizes 
120 film allows several frame sizes.
|Name||Aspect ratio||Nominal size
|6 × 4.5||1.35:1||56 × 41.5||15 or 16†||30–32|
|6 × 6||1:1||56 × 56||12 or 13||24–27|
|6 × 7||1.25:1||56 × 70||10||21|
|6 × 8||1.37:1||56 × 77||9||19|
|6 × 9||1.50:1||56 × 84||8||18|
|6 × 12||2.1:1||56 × 118||6||12|
|6 × 17||3:1||56 × 168||4||9|
|6 × 24||4:1||56 × 224||3||6|
†User selectable on newer cameras, if a roll is only partially used then a "kink" may appear in the film where the roll touches rollers in a film back magazine and this may end up on a frame; this is not a problem when 15 exposures are used as the gaps between exposed frames is larger, nor if the camera is not used intermittently.
The 6×9 frame has the same aspect ratio as the standard 36×24 mm frame of 135 film. The 6×7 frame enlarges almost exactly to 8×10 inch paper, for which reason its proponents call it "ideal format". 6×4.5 is the smallest and least expensive roll-film frame size; equipment to take photos in this size is also the lightest.
Cameras using 120 film will often combine the numbers of the frame size in the name e.g. Pentax 6×7 (6×7), Fuji 617 (6×17), and many 645s (6×4.5). The number '6' in general, and the word 'six' are also commonly used in naming cameras e.g. Kiev 60 and Pentacon Six.
Other similar 6 cm roll films 
The 105 format was introduced by Kodak in 1898 for their first folding camera and was the original 6×9 cm format roll film. The 117 format was introduced by Kodak in 1900 for their first Brownie camera, the No.1 Brownie, 6×6 cm format. These formats used the same width film as 120 film, but with slightly different spools. The 105 spool has a much wider flange, similar to the 116 spool, while the 117 spool's flange is slightly narrower than the 120. The 105 and 620 spools also have much thinner flanges than the 117 and 120 spools (0.025" vs. 0.060"); as a result, an unmodified 120 spool will not fit a camera designed for 105 film, such as a No. 1 Folding Pocket Kodak, as the overall length between the outside of the flanges is too long to fit the width of the film chamber.
The 620 format was introduced by Kodak in 1931 as an intended alternative to 120. Although mostly used by Kodak cameras, it became very popular. The 620 format is essentially the same film on a thinner and narrower all-metal spool (the 120 spool core was made of wood at that time):
- 105 2.509" width, 1.250" flange, 0.468" core
- 117 2.470" width, 0.875" flange, 0.468" core
- 120 2.466" width, 0.990" flange, 0.468" core
- 620 2.468" width, 0.905" flange, 0.280" core
Hence the 620 is sometime referred as "small hole" 6×6 or 6×9 as opposed to 120 "large hole". The 620 format was discontinued by Kodak in 1995, but it is possible to rewind 120 film onto a 620 spool in the darkroom for use in 620 cameras. According to Kodak, the narrower metal spool allowed building smaller cameras. Nonetheless the 120 format cast-metal bodied Voigtländer Perkeo remains smaller than any 620 format camera.
See also 
- 616 film
- Category: Film formats
- Film format
- List of color film systems
- List of film formats
- Medium format (film)