The Linhoff M679 is a multi-film back adapter that allows you to mount film and other camera accessories.You can mount the Mamiya RB film or digital back, Mamiya 6x8 motor back, Linhof rapid Rollex 6x7 slide-in back, Horseman 6x9cm cassette, and Silvestri film back to your view cameraThis universal adapter can be used with the Linhof M679 or M679CC view camera