So I was thinking about the new Nikon D800 and perhaps Canon's response to it. While many of us covet (and enjoy) full frame benefits, there are a few drawbacks compared to crop sensors. Most notably for wildlife and bird photographers who take advantage of the pixel density and crop factor crop sensors afford. Getting your 500mm monster reach as far as an 800mm goliath because of the crop saves a small fortune and work lugging it around by pairing it to a 7D. In this realm, the crops take an advantage.
However, with an ultra high density sensor like on the D800, one could crop in significantly more and achieve the equivalent "reach" afforded by a crop sensor without a loss in quality as the remaining pixels will most likely be more than enough for most purposes.
However, my understanding is the processors and memory have a hard time moving 36mp images quick enough so fps is reduced and I suspect the buffer would fill quickly. However, if the camera were to only use the middle portion of the sensor, effectively turning it into a crop camera, the MP count would be reduced and file sizes would be significanly smaller. If this is done (while still shooting raw), could the fps cound be significantly boosted for say BIF shoots or other situations where maximum reach is needed WHILE good fps performance is also needed?
Who knows, maybe there will be a 5DX 45mp monster. If so, and it got f8 autofocus, maybe it would become the go to camera for bird photography.
Anyways, just a though.