About Medium Format （Film）
The 120 format is typical of roll film. The spool was originally made of wood with metal flanges, later all metal, and finally plastic. The film is at least 30 inches (76 cm) long, up to 32–33 inches (81–84 cm),[1] 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.
120 film allows several frame sizes.
120 frame sizes
NameAspect ratioNominal size
(mm)Exposures
120220
6 × 4.51.35:156 × 41.5[2]15 or 16†30-32
6 × 61:156 × 5612 or 1324-27
6 × 71.25:156 × 701021
6 × 81.37:156 × 77919
6 × 91.50:156 × 84818
6 × 122.1:156 × 118612
6 × 173:156 × 16849
6 × 244:156 × 22436
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