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Distortion is an effect you'll see in your images when you're shooting with shorter focal lengths--that is, wider-angle lenses. It's a spherical distortion that makes the image look like it's bulging out or in, and your D800 can attempt to compensate for that automatically when you're using certain lenses. If I go here into my Shooting menu, I've got something called Auto Distortion control, which defaults to off. I can simply turn it on. And the D800 will try to automatically correct barrel distortion anytime that you're working with a wide-angle lens.
It only applies to type G and D lenses. So, if you're using a different type of lens, you are probably not going to see any results, but you might. Remember, this is only affecting JPEG images. As with the Vignette control, I would recommend turning this feature off. Photoshop has very good distortion controls that give you a finer degree of control, so it's better to just shoot the cleanest image you can and correct it yourself later.
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