I am considering replacing my Graphic View II with a Toho FC-45X, and had a couple of questions. I read elsewhere that the Toho spring back can open quite far, so I shouldn't have any problems using my Grafmatics, right? But what about a roll fim back? From the one rear view I found of the Toho, it doesn't appear to have a Graflock back; does it? Does the back open so far that you can just slide a whole Horseman or Wista roll film back inside? I see that the Toyo-View and Cambo backs can be slid in in place of a sheet holder, but I was thinking of getting the Horseman 6x12.