Here's a question -- I've got an old Bessa here that uses both 120 and 620 film -- the adjustment is really very simple, with spindles that adapt automatically for the small and large key holes. The film chamber, made for 120, obviously doesn't need to change, only the keys that hold the supply and take-up, and the way the key that winds the film adjusts automatically is both simple and ingenious.

I know Kodak made cameras that could only use 620 so people would have to buy Kodak 620 film, but why did other makers not make cameras that could use both, just to make life easier? All it seems to take is the adjustable spring-loaded keys this Bessa has.

Very puzzling.

obviously, i meant to write voigtlander up there. d'oh!