pwm2 wrote in post #14033543
But 10 MP -> 20 MP is a bigger step than 20 MP -> 40 MP.
12MP to 21MP is 75%. 21MP to 36MP is also 75%.
The higher you get in MP, the less you actually gain because of lenses, diffraction etc. Why can't you just step back and wait for real photos instead of running around madly chasing your own tail based mostly on digits in specification sheets?
I never find myself running anywhere near hard diffraction limits, and only rarely at f-stops where diffraction softening is relevant. And that's while shooting landscapes for maximum DOF. Lens softening isn't an issue at these resolutions with good lenses - after all, the D7000 has the same pixel pitch as the D800, and performs just fine. Besides, to avoid moire, you want the sensor to outresolve the lens - that's the whole theory behind the AA filter.
But an issue here is that the sensor doesn't have pixels all the way to the edge - it also have a bit of logic for communicating with the outside world.
These non-light-sensitive areas don't need to be on every edge of the sensor, though - just two edges perpendicular to each other. With some more-complicated production techniques (possibly 3D printing) you could even place all this behind the sensor.. The APS-H 1D sensor was a single chip made from a single wafer of silicon, but the full-frame 1Ds sensor was several pieces stuck together. So, it's possible, and has been done in a production camera.