Originally posted by ytterbium Interesting..
So since the swing of the mirror is at the sensor side, it wont hit a lens that protrudes deeper.
I wonder what lenses can you actually stick in the 645 mount when some space for adapter is allowed. M's and A's i guess can be used at some fixed aperture setting, but the ring is not accessible when the lens is mounted.
The looking patent like makes them quite creditable. May you happen to have a link to the patent itself, somewhere online? Has this idea been used already before in any film MF cam?
Mirror box:
United States Patent: 7334949
Lens adapter:
" [0026]In an embodiment, a camera system is provided, including an interchangeable lens including a lens-side mount ring and an annular packing made of a resilient material; a packing-incompatible camera body including a second mount ring to which the lens-side mount ring can be coupled, an inner peripheral surface of a rear end of the annular packing being positioned radially outside of the second mount ring in a state where the lens-side mount ring is coupled to the second mount ring; a packing-compatible camera body including a first mount ring to which the lens-side mount ring can be coupled. The first mount ring includes an annular portion identical in size and shape to a corresponding the second mount ring, and an annular contacting portion provided on an outer periphery of the annular portion of the first mount ring, an outer diameter of the first mount ring being greater than an inner diameter of a rear end of the annular packing in a free state.
[0027]According to the present invention, the relative position between the interchangeable lens and the camera body to which the interchangeable lens is mounted in the optical axis direction becomes appropriate in either case where the interchangeable lens is mounted to the first-type camera body (packing-compatible camera body) or the second-type camera body (packing-incompatible camera body). Therefore, in the case where the user buys the new interchangeable lens with the annular packing, a lens optical performance in accordance with the lens design thereof can be achieved even if this interchangeable lens is utilized with the packing incompatible camera body already owned by the user. "
United States Patent Application: 0080075454
" 9. A camera system comprising: an interchangeable lens including a lens-side mount ring and an annular packing made of a resilient material; a packing-incompatible camera body including a second mount ring to which said lens-side mount ring can be
coupled, an inner peripheral surface of a rear end of said annular packing being positioned radially outside of said second mount ring in a state where said lens-side mount ring is coupled to said second mount ring; a packing-compatible camera body including a first mount ring to which said lens-side mount ring can be coupled,wherein said first mount ring includes an annular portion identical in size and shape to a corresponding said second mount ring;
and an annular contacting portion provided on an outer periphery of said annular portion of said first mount ring, an outer diameter of said first mount ring being greater than an inner diameter of a rear end of said annular packing in a free state. "
This maintains fully auto operation of the lens.
Regards
Rui