According to Ken Rockwell, actual image size of 6x7 medium format is 56x72 mm. Many cameras vary the long dimension anywhere from 68 to 73 mm. Also you'll get 10 shots per roll of 120 or 20 shots per roll of 220.
The 6x7 medium format, also called "Ideal Format", was coined by a marketeer during the great medium format wars of the 1960s and 70s. It refers to the fact that you can pull an 8x10, 11x14 or 16x20" etc. print with almost exact cropping without losing any of the film image. By comparison, Ansel had to crop off some of the top and bottom from his 6x6 images to print an 8x10, and likewise folks using 6x9 have to crop off some of the sides.
Today the Mamiya 7, Mamiya RZ and RB 67 and Pentax 67 are the leading cameras in 6x7.
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