Ok, I did some searching, but have not found all of the answers I need. Im looking into a project where I need to be able to shoot as many shots as I can without reloading the camera. The camera will be left alone and fired by an intervalometer for an extended period of time. Im looking at getting an A70 back for my Hasselblad, but am unsure of what extras I need to get it to work. I know I need a cartridge to load the film onto, but I do not know if I need two of them to properly use the magazine. I am also open to any other high capacity Hasselblad compatible film magazines that are somewhat affordable. The more shots it can take the better. And one last question. Does anyone still develop 70mm color film, of am I on my own for that? Any help is greatly appreciated.