I used 120 and 70mm (120 with tractor holes) for 126 refills. I have a Kodak Tourist in 126.
I used polaroid 6-packs to dial in my view cameras before using the real film for the money shot. The prints were crap, but it beat guessing about my settings, and was faster than using the light meter and math. Today I've adapted my digital Nikon for polaroid duty -- made backing plates to replace the film holders for the 4x5s and 8x10 with Nikon lens mounts. So I can set the exposure and bellows factor without using the expensive sheet film, and use the ground glass (I have Beattie screens) for composition and focus. When it costs $20 to pull the trigger on 8x10 I'll take all the free help I can get!
The Nikon takes interesting pictures through the old view lenses. The lenses were not optimized for color film, so the focus planes for RGB elements are at different distances from the lens. That means that only one color comes up sharp on film unless you use an aperture smaller than about 48. The result is a soft focus overall at wider apertures and a slight oversaturation to the properly distanced color. But I do get to use my 1006mm lens (40") with the Nikon. I can take head and shoulder images of whales from a mile away.
