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Message: <blockquote data-quote="J-see" data-source="post: 519897" data-attributes="member: 31330">Noise levels can be measured. A pixel with twice the surface area will gather twice the amount of photons during the same time. That results into a shot that has a better quality of signal. Like I said in another reply; the amount of exposure is identical since that is a % of the full well capacity but the quality is different since that depends upon the signal measured (photon count).You can check the dB (or SNR) of all cams at every ISO and then compare those to check how much better an FX performs (signal-wise). That difference can be expressed in stops of light.The "new" sensors will use different technology (BSI from what I read) where again light gathering is of the importance. The surface area will remain identical but the quantum efficiency will be higher which results into the same difference in regards to signal noise.</blockquote>