Greg Jones , Jan 29, 2010; 08:10 a.m.
I have one of those very sliding backs that Ray speaks of. Mounts on a 4X5 camera and uses the Mamiya "S" curved film backs. I plan to sell it, probably quite cheap. It is in mint condition. My email does not work via this site, but I guess watch the for sale postings over the next couple of weeks or so on photo net.