Originally Posted by kuzano
I may make a mask to use my 65mm, and I may get a 50. I may put my 100 f2.8 on and mask as well.
Could you explain a bit more about why you'd like a mask? You mean shoot 6x12 with the 65mm or 50mm and then mask the film? I'd recommend shooting the whole frame and then cropping if needed. Or, if you want to shoot 6x9, you could also get a Horseman 6x9 back (made for 4x5s). They are less than $100 and are great.