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This is a couple of illustrations to explain briefly the different process of transforming photons to digital unit. And to explain the differences between sensor with different pixel size (D750 vs D850), how the gain is adapted in order to have the same grey level for a given exposure and a given iso. Whatever the spec. of the sensor's pixels.
A) a D750 Pixel exposes to lightB)  a D850 pixel expose to light.C) Same grey level with different exposures and iso

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