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Auto ISO Behavior

Started Jul 22, 2021 | Questions thread
Erik Baumgartner Senior Member • Posts: 6,893
Re: Auto ISO Behavior

frostyj75 wrote:

Am I not understanding how auto ISO is supposed to work? It is very frustrating, thinking that I'm going to get a certain SS and then notice the ISO has gone up instead of the shutter.

If the shutter speed went up, it would have opposite the desired effect.

If you need more exposure/brightness either the aperture needs to be wider, the ISO has to go up, or the shutter speed has to go down, if you have a minimum shutter speed in place, the camera will reduce the shutter speed until it hits that limit and then, and only then, will it raise the ISO. If your camera raised the ISO, it did so because it had no other choice - either there wasn’t enough light or your chosen aperture was too small for base ISO.

I end up going back to manual ISO, I'm just wondering if there is something I am missing in the equation.

Thanks!

Jeff

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