Hartblei have cooked up something rather wacky, a medium format camera with a 35mm lens mount! While at first this seems counter-productive, it appears the main impetus is to enable very wide field of view, especially when using their own tilt/shift lenses or the TS-E lenses from Canon.
So far they have targeted Canon EF, Nikon F or Sony Alpha mounts. I wonder if Pentax 6x7, 645 or k-mount might be forthcoming? Maybe not for this application.
Obviously not just any lens would work optimally, but the press release states that "many lenses designed for DSLRs, including the Zeiss 100mm F/2 Macro, Nikkor 17-35mm ED and 14-24mm G-ED produce large enough image circles to illuminate larger format sensors (though their performance will only have been optimized for their native formats)."
The Hartblei CAM costs €4985 plus shipping and taxes. On top of that you need to shell out for a digital or film medium format back (up to 4.5x6cm).
Details on
dpreview.