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Auto ISO Sensitivity not behaving as expected

ultinikon

Hudson, US
113 posts

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ultinikon Gold Member Nikonian since 17th Feb 2014
Wed 12-Mar-14 12:39 PM

I have Darrell's book, and I thought I understood the section on Auto ISO Sensitivity, but my D7100 is not behaving the way I would expect.

Camera is using one of the SCENE modes, ISO is set to Auto, Auto ISO Sensitivity control is ON, Maximum sensitivity is set to 3200, and Minimum shutter speed is set to 1/250 s.

I'm shooting indoors with an f2.8 lens.

With these settings, I'd expect the ISO to hit 3200 before the shutter speed starts slowing down.

However, what I see when I depress the shutter-release halfway is an ISO of 1600 and a shutter speed of 1/80 s.

To get the camera to use an ISO of 3200, I had to set the ISO to 3200.

What am I mis-understanding?

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