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Your Mark III has a huge number of features, and you don't need to worry about trying remember every one of them. Carrying your manual isn't always practical, because it's pretty large, so Canon has built a help system into the camera. For example, if I come here to Long exposure noise reduction, I first get a little hint as to what the feature is: Noise reduction is applied to images exposed at one second or longer. But any time I see this Info Help thing down here, that means I can press and hold the Info button to get a little more information.
Auto is generally recommended for noise reduction. It may not be possible to shoot again until noise reduction is finished. So I'm going to set to Auto, because that's what the help is recommending, and I'm going to trust it. So any time you see that little icon, you're going to be able get a little more information. Here you see that there's a hint, but not as separate help page. So just keep an eye on that if you're confused. If you find it again just remember it's the Info button to read the feature guide.
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