New answers tagged noise
Shot noise goes with the square root of the number of photons, so every time you have 1/4 the photons you have 2x the noise (with respect to the signal). (Example - 400 photons has 20 average noise, 100 photons has 10, so go from noise is 1/20 to 1/10.) Note that pixel electron capacity goes down as ISO goes up, as there is a limit as to how far you can ...
Use the sensor database at dxomark.com. Their measurements are far more likely to be objective and empirically based than comparing sample images, since comparison becomes meaningless when the samples are not shot in the exact same conditions.
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