I now have a Petzval lens that I think will work for me. Dang, it's pretty! I now need to mount it to an aluminmum lens board and put it on my Shen Hao 4x5. Lens board has a 3.25 inch reinforcing ring built into the back of it, and the lens will easily fit inside that. Thickness of the metal is 2mm. Exitisting hole is for Copal 1 and is about 140mm. New hole needs to be 155mm. What should I try cutting it with? I could wait to take it to a machine shop, such as a John Deere dealership (tractors/farm implements.) I've taken my cameras there before when I needed some professional but cheap machining done.


Kent in SD