Some like Dante Stella make a case for giving up on old folders. And as usual he is quite persuasive, and always entertaining to read. But still, I think there is potential for lots of fun with old folders. I picked up an old Mamiya 6 (not the New Mamiya 6) and found the initial results to be rather unimpressive. The contrast was very poor and the edges were washed out. See here But then I bought another broken one in the junk bin and combined elements from the two lenses, picking the cleaner looking ones. I also redid the light seals and finally I found a lens hood for it. The resulting improvement was quite dramatic. See here. Altogether I spent less than $75 on this project, thoroughly enjoyed myself, and added a nice camera to my bag. How can you go wrong there?