Originally posted by Anvh But the distance from the mount to the sensor will need to stay the same or else your lenses won't work anymore.
Look up register distance if you want to know more.
For you CMOS sensor 645D, nice story but such a sensor is very espensive to develop that means they either need to sell a lot of make the product very expensive.
CCD is much better for MF cameras and they have better image quality at lower ISO and there where most use these cameras for, landscape or studio photography so high ISO's aren't that important.
Then there is another problem with EVF, if they want to replace the quality of the OVF in for example the 645D they need to be big and that will be a huge drain on your batteries and it heats your sensor up because it needs to be on, which isn't good for image quality.
So i doubt we will see EVF in the top segment fast... a hybrid viewfinder is much more likely.
APS-H, a wonderfull idea but who make APS-H sensors these days?
Lot more FF sensors are made and develop so it might be easier and cheaper to use them.
Can we discuss things that can actually work?
You would have to develop a new lens system and older lenses would work with an adapter. Just like m4/3 but all of your old manual focus MF lenses could work. I understand register distance.
Samsung will make what ever size sensor you want. They made a 36MM x 36MM MF sensor for internal use. Sensors can be cut from any wafer that is in production. You want APS-H? You want MF format? IT is not as big of a problem as it was a few years ago. Sony, Samsung, Kodak, Fuji has a new one rumored to be on the way, DALSA, Panasonic all make sensors that are sold to other camera companies. It was not too long ago that there were only a couple.
FF sensors still cost 6x what an APS-H sensor costs and easily 10x what an APS-C sensor costs. There are currently only 1 Canon FF sensor, 1 Sony FF sensor (A900, A850, Nikon D3x) and the 12MP FF found in Nikon D3s and D700 which I believe is also a Sony sensor. When you say "lot more FF sensors" how many do you think there are?
There are 2 APS-H sensors still in production as the Canon 1DIV is still being sold, and the Leica M-8 has a Kodak APS-H sensor. That is 3 FF sensors vs 2 APS-H.
Samsung has been trying to sell their sensors and will make whatever you want. If you take the existing 300mm wafers that Samsung is using to make the new 20MP APS-C and used to to make APS-H sensors you get a 24MP APS-H. There was rumors of a Samsung made m4/3 sensor for the new Olympus "professional" m4/3 that is in the works.
I don't really expect Pentax to take this path since they seem to prefer to follow Nikon and Sony. With Sony, Nikon, & Pentax all using the same sensors it makes it hard for Pentax to separate themselves and attract those new camera buyers who have been exposed to WAY more marketing from Sony and Nikon. Pentax is the little known "ME TOO" camera maker that only old school photographers know anything about. They really need to do something "outside the box"...... other than the "Q"