Does ISO do anything in RAW but set point for opening in converter?

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Caerolle
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Does ISO do anything in RAW but set point for opening in converter?
7 months ago

So, probably a stupid question...

If you shoot RAW, does the ISO actually affect the exposure? That is, is there any difference between shooting at say, ISO 800, to have a mediumly-exposed image when you open in your converter, versus just shooting at ISO 100, and upping the exposure by 3 stops in the converter?

My real question, I suppose, is, does changing the ISO actually change the output from the sensor, or just gain up the output from the sensor? I have heard it both ways.

The reason I am asking is that I do exposure to the right. However, unless I am using flash, I rarely can do that by having more than enough light. Generally, I am operating at the slowest shutter and widest aperture I can tolerate, and exposing to the right using ISO. Then I decrease the exposure in my converter. I have kind of come to think I am being stupid here. I wonder if I am as well off to just keep the ISO lower in the first place.

Thoughts?

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