Is there a good reference somewhere that discusses why digital camera sensors need ISO settings at all (instead of just being, say, 24-bit)?
My complete ignorance of all things hardware-related doesn't help, either...
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The full-well problem says there are technical limits to how much charge a sensor can encode, which limits dynamic range
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which means you still probably want an iso-ish analog gain to cover the full range (e.g. longer exposure in daylight).
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