What does the camera 120 volume mean?

At the end of 19, the birth of new photosensitive materials promoted the development of photographic equipment, and then various specifications of films and corresponding cameras came out one after another.

1900, Frank A.Brownell designed a compact cassette camera for Kodak Company in the United States, which was called Brownell1. This camera uses the film numbered 1 17, and the film is attached with protective paper, which can be loaded and unloaded during the day (you can take 6 photos of 57x57mm at a time, and the operation is quite simple. This film is the predecessor of modern 120 film. In 190 1, Brownie designed Brownie No.2 camera, with the picture size of 57x83mm and the film number of 120. This is the earliest film numbered "120".

1928, Fronke Heidecke Company of Germany developed a dual-lens reflex camera using Brownie film, namely the famous Rolleiflex camera. The camera uses outdated 1 17 film. In the second year, we made a film that can take 12 6x6cm pictures, which is the 120 film we use now. This type of film is used in all countries and has different names. For example, the model B2-8 made and sold in Germany (because it can take 8 6x9cm photos) was later adopted as the name of Kodak film number "120" in the formulation of international standards, and the number of this film was officially recognized by various countries.

The width of 120 film is fixed at 6cm, but the length will change according to the number of shots taken on the back of different cameras. Generally, there are the following specifications: 6×4.5( 16), 6×6( 12), 6×7( 10) and 6×9(8).