Originally posted by Serkevan Seeing as the sensor is basically ISO-invariant, couldn't you shoot at ISO 100 and push in post?
That doesn't work because data in raw files are no the same when shot at ISO100 or higher ISO. That was how a composite stack average of underexposed exposures produced banding, and another stack of added underexposed exposures doesn't show banding, although the total amount of exposure was the same in both cases. The raw file data is not the sensor data, explains why it's not the same to correct exposure in post versus using higher ISO.