ISO has no connection to film grain of the old days. ISO in digital cameras is APPLIED GAIN to input signal.
Resultant stored images are converted (AD converters) and processed thru SNR (signal to noise) firmware.
ISO, contrary to you being brainwashed that it is,....is NOT part of an "exposure triangle".
SNR, or the native signal gain which includes sensor efficiency, microlens design, and pixel pitch, and sensor design affects the SNR
All digital ISO is input gain applied AFTER the native image is captured (PAST TENSE)
Learn this fact. ISO only true ability is letting the photography MANIPULATE to desire, either Gain (aperture) or Time (shutter), nothing more.
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