I have a 3x4 RB Series B Graflex that I've been using successfully with a 6x9 rollfilm holder. Recently I've found some B&W 3x4 sheet film which I'd like to try out but I have no sheet-film holders and I'm not sure exactly what kind I need. Presumably the holders that fit into a spring-back Graphic would not work. I imagine the right kind of holder would have a narrow tongue on each of the long sides to slide into the grooves on the Graflex back. Is there anyone who can advise me on this? I'm also wondering just how difficult it is to find these holders. Any help would be much appreciated.
Thanks,
Billy Canuck

Billy,

These have been showing up on eBay lately with a fairly high frequency. Although the seller's often don't know what they are, or the distinction between a standard holder and a graflex holder. You are correct that their are slots cut into the holder on the top and bottom to lock into the sliders on your camera back. The light trap is a different style as well, being a groove rather than a ridge.

There was an auction yesterday that had a good photo of this type of holder, although in 5x7 size.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=011&item=320021796280&rd=1&sspagename=STRK%3AMEWN%3AIT&rd=1

Best Regards,

Harold