I started with a 9x12 Kodak Recomar, and also a similar Zeiss unit. That was Holy Cow! 45 years ago! I still have the cameras and every once in awhile I think of using them. Back then, we could get 9x12 in film packs, but I doubt we're going to find any of those now. I have a back that gives me a 6x9 on 120 film, which is what I most often used. That was really great, especially for portraits. I imagine the roll backs must occasionally appear.