I really need to work on this, I did some quick tests (no time to setup proper lighting, to do PP (white balance...)) but here are my first conclusions/examples for those who might be interested... http://www.techniphoto.com/wiki/index.php?title=PB-4_bellows
Try reversing your lens for macro, especially on bellows. You'd need a reversing ring like a BR2. The tilt option is really handy as well. Have fun with it though
Guy.
Thats a winner. I had one many years ago. I had the 105 bellows lens, however used many others. I had a enlarging lens(39MM0 to Nikon F adapter, and used many of the great German made enlarging lenses on it. Great find on your part-keep it!
Cheers
Harry