My “cheap RF” is a Kodak Medalist. This 6x9 camera uses a fixed 100mm 3.5 Ektar lens, with helical focusing. The lens is very sharp and contrast is good. The camera is built like a tank, very heavy, and can be used as a weapon if need be. The Medalists were issued to US Navy photographers in the early-mid 40’s. The Medalist uses 620 size film. Since 120 is the same size film (spools are bigger on 120), I just roll 120 film onto 620 spools. J&C & others sell 620 film, but it is rather expensive. I bought mine on ebay for $100.