donny1963
No longer a newbie, moving up!
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NO IT's not increasing voltage to the sensor, has nothing to do with ISO,, all it is, is applied GAIN to amplify the Exposure for lower lighting
I've tried to resist commenting but as others have already pointed out your understanding is not fully correct. Your statement above implies that all ISO adjustments are gain obtained by increasing voltage to the sensor to increase signal sensitivity (that's the definition of gain). The fact is that's only partially correct dependent on camera manufacturer.
There's actually three methods of adjusting ISO: native, amplified, and simulated. "Native" ISO is the ISO setting that does not require the camera to increase the voltage to the sensor to increase ISO. My K1MII has "native" ISO 100-819200. In years past "native" referred to the base ISO that the camera processor was able to handle without increasing voltage to the sensor or gain as you call it, but as processors and sensors have advanced the need to apply gain has decreased. Amplified ISO is an ISO that requires an increase in voltage to the sensor to achieve an increase in ISO. This is where you are correct in your OP statement, but this is also old technology. There might still be some manufacturers out there that do this but I'm not aware of them. Finally, Simulated ISO is when the camera uses a software algorithm to simulate even higher (or lower) ISOs. My understanding is it's applied after the shutter clicks, so if my understanding is correct then that would be another thing you were partially correct on.("it's applied AFTER THE PICTURE IS TAKEN"). The Nikon D850 for example has "native" ISO 64-25600, and software enhanced from 32-102400.
So what appears to be happening are mixed assumption partially correct and partially false. I suspect the videos you've been basing your assumptions on were either old, or the individual making them was basing their claims on older technology, and as shown above, blanket statements on ISO are not correct in today's world.
ISO is applied after the Image is taken.. NOT at the time the shot is taken, so voltage to the sensor has noting to do with ISO settings..
ISO is Applied Gain AFTER, I repeat AFTER the image is Taken..
the shot is taken from the sensor, to the Analog Gain, then to the AD converter, then ISO is applied as you see in the diagram..
So your wrong, and looks like YOUR your understanding is not fully correct at all..