This is an unused 3D printed camera that is part of an initial Kickstarter offering. It is universal, modular, and open in that it mounts a variety of large format or system lenses (Mamiya, etc) and a variety of film backs, range finders, and meters. This one is currently configured for medium format. I planned to mount a barrel lens (Petzval-type) in an Ilex #3 shutter, and mate a Horseman 6X6 or 6X9 film back, so I'd have a very lightweight non-bellows Petzal setup. But...I have way too much going on in my photo life, so I can't follow up on this project. Search for "Mercury System Camera", and you will find a ton of information from them, including an extensive list of appropriate lenses and film backs...it is quite something. I have maybe $140.00 in this set up, and I'd sell the kit (no lens or back) for $60.00 and free shipping. For the real photography experimenter, you can't go wrong.