Originally posted by OregonJim Maybe I'll pick up one of those cheap Chinese bellows I see on eBay all the time...
Look for one of the discontinued, major brand labels instead. There's some good deals on top of the line slide copier/bellows sets for discontinued mounts. This particular set even came like new with a nice 50mm Minolta lens for $18 two years ago. (How many people are going to wear out a slide copier/bellows unit anyway?!)
Remember, all you need is the focusing rack, not the bellows (although I've grafted bellows lens mounts with no problem). A robust aluminum angle bracket will eventually provide portrait-orientation but at the moment landscape format is adequate. Just experiment with the rack adjustment and mark or record the proper offset for each focal length. Old Vivitar 28/2.5 and SMC 50/1.7 primes keeps things simple for me.
Years ago I simply epoxied a lens to a bellows unit for a quick-fix lab setup rather than mess with the mount.