I meant that the inner portion ( where the screws are mounted) of the new mount side of the adapter, slightly protudes from the outer portion of the adapter (new mount side) Ã la or much like the canon FD lenses where the rear element portion of the lenses protudes and goes into the camera body. http://www.mir.com.my/rb/photography/companies/canon/fdresources/fdlenses/85mm.htm
We don't have many informations about the new camera mount, toward the new camera body female bayonet.
Considering that Canon EOS and Canon FD flange back were expressed in millimeters and were exact numbers, respectively 44mm and 42mm; i guess it will be an exact number for the new mount too.
It means 12mm or 14mm for the adapter length.
* A 12mm adapter means that an APS-C size mirror box could fit, but in a very tight fit.
(I made measurement on my rebel, measuring the distance between the EF mount and the mirror at it uppest possition when it lays flat under the viewfinder with the Bulb mode. I've found a little less than 12mm, in reality something much close to 11.5mm.)
That's why i guessed the adapter could measure 12mm, i thought Canon would keep the mirror but i've realized in the patent that they won't.
So you're right, the most likely adapter length would be 14mm.
* A 14mm adapter means (as expressed in the patent) that an APS-C size mirror box won't fit at all.
=> It's really a mirrorless camera, because they mention the lack of a mirror and its associated Phase Detection AF device in the new mount.
Furthermore, we don't have any specs about sensor size. Without a mirror they would put anything they want. It could be Full Frame 24x36, Canon APS-H, APS-C size or even smaller than APS-C. After all the adapter is made for APS-C EFS lenses...so APS-C is the most likely.
From this point, we can say unanimously that new mount flange back distance will be exactly 30mm (44-14=30).
=> The new camera will NOT BE a kind of fusion between an EOS RT (OVF with fixed pellix mirror) and a small mirrorless camera such as a samsung nx, even with the addition of the OVF.
It could have been interesting for me, but some user at the time of the EOS RT repported the lack of incoming light and flare/ghosting issues due to pellix mirror. EOS RT wasn't a succes. I think that's why Canon doesn't want to do the same mistake again.
In fact, there is only one way to follow for Canon.
The mirrorless offering is already quite huge:
* Olympus/panasonic Âµ43
* Samsung NX
* Sony Nex
* The future Nikon mirrorless with 16mm diagonal length sensor (x2.7 crop factor)
After the huge enthusiasm around the Fuji X100 and the hard beginning of Sony nex (only 3 lenses available), i bet that Canon will release a RANGEFINDER APS-C based sytem !!!
A 30mm flange back is close to other RF flange back of the past such as Contax G&RF and Nikon RF...http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
This new canon Digital RF sytems would sit right beetween high end compact camera (Canon G12) and bigger entry level DSLR (canon eos rebel/xxxd) in term of compactness.
For the price this won't be that simple...i let you imagine the price.
This new sytems could be a poor's man leica M RF competitor of the digital era (with liveview and AF). We could expect it would cost something between 1000~2000â‚¬.