Hi everybody - I have been using a Mamiya 7 and a Hasselblad for a while now, and generally speaking I use my Mamiya almost exclusively for vistas and scenes where I like a lot of detail/DOF (basically with the 43mm lens). I have been thinking I would be better served by selling this system and getting a "swing" system - one where I have the ability to use different backs/masks to shoot 6x7, 6x9, 6x12, up to 4"x5". I know Horseman has something like this, but admittedly this sort of thing is a little beyond my knowledge of photographic gear. Am I talking about a "technical" camera? It'd be cool to someday use a digital back with this setup too, but not for a long time. Am I nuts, or does something like this exist?