Ok.....Just for the hell of it I took the mount off a dead Nikon F and machined a larger hole in a Calumet recessed lens board and mounted it on a 1940 Speed Graphic. I put my 50mm 1.2 on it and focused it just fine. It gives an interesting image on the glass. The shutter is erratic since I have not used the camera for 30 years or so and I'm out of film right now, But it does work.