Medium Format Film Holders
Film holders are available as accessories for some medium format cameras. The most usual case is the Polaroid back taking instant film, often used to check exposure values, color rendition, etc. before taking final photographs on conventional film.
Several of the types of holders made for large format film, including darkslide sheet holders, Grafmatic multi-sheet holders, the Graflex bag mag, and film packs were also manufactured in medium format sizes, almost always 2¼"×3¼" (6×9 cm). Press camera manufacturers often produced smaller versions of their 4×5 cameras in this size, often called "23", and while later versions of these cameras could use rollfilm adaptors, these were not widely available until almost 1950, and were expensive in the their first years of production.
Sheet film or glass plate holders for medium format rollfilm cameras can be found, but are of mainly historical interest. Some rollfilm cameras have interchangeable backs to allow films of different types to be used. Some 35mm cameras have motorised backs which may hold longer than normal lengths of film, with a mechanism which automatically advances the film after each exposure.
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