What exactly is a Medium Format Camera and what type of photography is it used for?
Medium format cameras use 120 or 220 roll film, which is about 6 centimeters wide (2 and 1/4 inches). This size of roll film was introduced in 1898 by Kodak for its Folding Pocket KODAK Camera. It thus seems safe to say that the world has reached agreement on the proper height for a medium-format negative. On the other hand, nobody has ever agreed on the proper width. There are many standard widths for 120 camera frames: 645, 6×6, 6×7, 6×8, 6×9, 6×12, and 6×17. These numbers are ostensibly in centimeters although in practice a 6×6 camera such as a Hasselblad will expose a 56 x 56 mm frame. They can be used for whatever type of photography you wish.
