I wonder if this was already mentioned. Not medium format really, but a method for using your Canon or Nikon DSLR as a digital back with your medium format and view camera equipment.
Sinar p-slr
Sinar p-slr
July, 2010: The Sinar p-slr was designed especially for photographers who would like to combine the convenience of digital single lens reflex cameras with the advantages and quality characteristics of a Sinar view camera. Exact control of perspectives and selective sharpness - the most important creative tools in photography - can be set and evaluated precisely on a view camera.
And now, Sinar also made all of these advantages available to the users of 35 mm SLR cameras. This well thought-out solution brings a significant enhancement of quality to users of 35mm cameras, because the high-resolution digital Rodenstock lenses can be used. The Sinar p-slr complies with the Sinar policy of offering photographers modular systems that are in keeping with the latest trends of the market. This upgrading set will be available as of August 2010 and it can be ordered right now at the price of 1980 Swiss Francs (not including the Value Added Tax).