i see it this way.
canon must have a good reason to choose 18 MP for itÂ´s new camera.
if they could have produced the camera with the same specs but 30 MP im sure they would have done that. donÂ´t you think so?
so it seems that CMOS (that includes foveon like sensors) and CCD sensor technology is slowing down.
and itÂ´s not as easy as producing faster CPUÂ´s for a computer.
for faster CPUÂ´s you make the DIE bigger or shrink the lithography process to put more transistors on the DIE. you can also hardcode special functions to speed up calculations.
but even CPUÂ´s running against a wall, for years we are around 4 GHz.
a 35mm FF sensor must have a certain size, you canÂ´t make it bigger.
unlike CPUÂ´s shrinking is not the holy grail.... smaller photosites will not help you increasing DR or reducing noise.
there is not much you can do when you reach a certain point of optimization.
you canÂ´t influence the absolut number of photons that reach the sensor area (of course you can, for example with flash... but i think you get what i mean
) and you can not increase the absolut sensor area.
you can only decrease the size of additional circuits to make more room for the photosites (as canon has done for the new sensor. sony has done it with itÂ´s backlit sensor), so the photosites can catch a greater percentage of photons.
sure you can always try to reduce the SNR but that will be expensive at a certain level.
new materials could help or a new sensor technology.
but i think we should get used to smaller steps in sensor development.
however it will not outperform the 5D MKII in resolution, after proper sharpening is applied.
i say that depends on the AA filter thatÂ´s build in. but i have not done the math.
how is optimal resolution of the new 18 MP sensor compared to real world resolution of the 5D MK2 (i know that is unfair
it may not outperform the 5D MK2.. but it could be a imperceptible difference.