Hot answers tagged nikon-d40
They are relative numbers intended to shift color temperature by perceptually uniform steps. There is an underlying unit called the Mired and each step corresponds to an undisclosed number of them. This is in contrast with fixed steps in the Kelvin scale which would not be perceptually uniform.
That's a warmth adjustment that lets you "fine tune" the white balance for aesthetics (as opposed to accuracy). You might find that a value of "+1" (a little warmer, approximately the same as an 81A filter) gives more pleasing (or healthier-looking) skin tones than the flat "0" setting does, or that a +2 or +3 makes autumn foliage look better. You may find ...
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