Native iso is "the sensitivity you get without amplifying the analogue signal you get from the sensor". Unity gain ISO is "the ISO of the camera where the A/D converter digitizes 1 electron to 1 data number (DN) in the digital image." They both seem to be the same but the unity gain ISO is unique for each camera whereas the native iso is a range of ISOs. If no amplification means assigning 1 digital unit to 1 photoelectron, aren't both native ISO and unity gain ISO the same?
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