on the medium-format professional market.

Medium format

Common medium format frame sizes on 120 film include 645, 6×6, and 6×7, named for the nominal frame dimensions, in centimeters. These were derived from fractional imperial units, so the actual frame size is slightly different from the nominal dimensions:
* 645 = 56 * 41.5 mm
* 6×6 = 56 * 56 mm
* 6×7 = 56 * 67 mm

Mamiya made a series of square format (6×6) twin lens reflex

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