Quote Originally Posted by Halka View Post
Of the stuff David mentioned, I'm not sure about Topcon, if I remember correctly these don't have a focusing helicoid.
Topcon RE uses a version of the Exacta bayonet. I've got EOS and FD Exacta adapters and have used a Topcor RE 58mm f/1.4 with them. The Topcon UV system is leaf shutter and the aperture control is on the body.