I have a Rodenstock Ysaron 1:4.5 150mm lens mounted in a a self cocking Copal Shutter with a ring flash. The whole mess is mounted on a Sinar lens board that I use on my Sinar F2. I only mention it because the self cocking shutter may be a good solution to use with your enlarging lenses and you wouldn't have to use a focal plane shutter. You would still have to manually stop down your lens of course.