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By default, your ISO control let's you change ISO in the third stop increments. In other words, if I press the ISO button, and turn my main dial, I go from 100, to 125, then to 160, and then to 200; 200, of course, being a doubling of my original ISO, or one stop. If you don't like going in third stop increments, either because you're used to thinking in terms of whole stop increments, or you feel like it takes too long to get to the ISO that you want, you can change this, so that it goes in whole stop increments.
Go into the Menu, go to the first page of the custom function screen, and you'll find ISO speed setting increments, which defaults to one third of a stop. Go in there, bump it up to 1/1, or that is a full stop, and now when I come out here and hit my ISO button, I go from to 100, to 200, to 400, and so on. If you're working in Manual mode, you might have an easier time thinking in terms of full stops, particularly if you're not using third stop increments in your shutter speed, and aperture. If you are coming from an older digital camera, or for film, this is simply more what you're used to.
You may find that when you're working on your own, just don't need that level of granularity, so this can be an easier way to work. Note that when I have this set to whole stops, Auto ISO will still work in third stop increments. So here I've metered, and I'm using exposure compensation, and you can see that it's going up and down in third stop increments. So I'm not losing that capability; I'm just changing basically the granularity of this one control.
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