Hello all, Looking to get a back for my 500C and 500CM to shoot 220 film. I believe I am correct in that the A24 is the back for 220 on those bodies, no? And if so what does it mean "WITH 24 RELEASE" vs. one without that? KEH has A24 backs identified as 30104 or 30224 or 30225 and some with no number mentioned. What is the difference in these? (I'm guessing xxx24 and xxx25 are simply chrome and black, respectively), and would all work with my 500C and CM? Also, what is an A16 back? Pls excuse the noob questions I'm not all that versed in Hassy accessories and gear. Oh, and if there's a web site that answers these please point it out. In the meantime, thank you! Richard S. San Francisco My Commute Photo Blog http://shootingonthefly.blogspot.com/ My Flickr Page http://www.flickr.com/photos/rich8155/