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Auto ISO Behavior

Started Jul 22, 2021 | Questions thread
Mike1988 Regular Member • Posts: 137
Re: Auto ISO Behavior

frostyj75 wrote:

Hello all, I have been using auto ISO here and there to see what all the fuss is about. I have been really pleased with it and generally top the ISO out at 6400. I have found that it appears to raise the ISO before it raises the shutter speed. When I have my 23mm on, I have the settings at Base ISO - 200, ISO Limit - 6400, and shutter at 1/60th. In bright daylight, the shutter will stay at 1/60th and the ISO will be up over 1000 at times. Isn't the ISO supposed to stay at the base and only raise when the shutter is at the limit?

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

Thanks!

Jeff

Do you have set a fixed aperture or is it on A? Nd?

In your example the camera reached the minimum auto iso speed and then raised the iso accordingly. So it has no sufficient light (otherwise you'll get white images), may be the iris stopped down, it was not mentioned.

Something is wrong in the basics here, my opinion.

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