Looking for a 56 mm Retaining ring or a 101 x 101 mm lens board with a 57 mm thread. I am trying to mount a Fujinon-EX 135/5.6 lens on to my Beseler 45. I tried the Large Format group but my McAfee will not allow me to go there. This is the only safe one I can use. I have tried the stores in Vancouver but they look @ me with a blank stare. At least @ Leo's the guy got up and looked but 52 & 58 mm was all they had.