Rollfilm back
An adaptor that fits onto the back of a large format camera to allow roll-film to be used back. Also used on many medium format cameras to allow film to be changed mid-roll.
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A first rollfilm device was patented in 1854 by J. B. Spencer and A. J. Melhuish. It used "sheets of calotype paper gummed together and wound on rollers" [Coe]. In 1875 L.
Rollfilm. Photographic film, usually 6.2 cm wide (known as 120), attached to a numbered backing paper and rolled on a flanged spool.
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[edit] Rollfilm holders
Film holders that allow rollfilm to be used on cameras normally used with sheet film are usually called film backs.
I almost bought a 3" Goerz Rectagon once; this lens was designed as an aerial reconaissance lens for use with 5" rollfilm Metrogons and a few other lenses meant for aerial recon use were made in more focal lengths than the Rectagons I've played with; ...
developing tank Small plastic or stainless steel tank into which 35mm or 120 rollfilm can placed in, on spiral reels, for processing. Lightproof tops allow solutions to be poured in and out in daylight.
When I was 5, my uncle Al gave me an Ansco cadet—a 120 rollfilm camera with a fixed-focus lens and two modes: “Color' and “Black and White'.
Medium format cameras use 120 and 220 film ("rollfilm") and produce a negative approximately four times the size of a 35mm negative. Unfortunately, this makes them four times the size and 4-16 times the price of 35mm equipment.
I use no development changes; remember this is rollfilm. I don't worry about any contrast increases per frame, they are yours to worry about. If I worried about this I'd experiment with the Tiffen Ultra Contrast series of filters.
 See also: Film, Camera, Lens, Exposure, Image
  
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