When teaching I had a room filled with Beseler 23's (10) and never, on any of them, did we have to have the bellows flat. Never. We used Nikor, Schneider and Rodenstock 50mm lenses for 35mm negatives. Each had its own fiddling, but all were roughly the same settings on the lower bellows, since they are all 50mm lenses. The top bellows setting is very important. Make sure it is at the top of its travel for a 35mm neg. Beyond that, I can't say what is wrong, but difficulty in focusing with a 50mm lens is definitely unusual.
Last edited by Whiteymorange; 12-30-2013 at 10:51 AM. Click to view previous post history.