The rule of thirds involves mentally dividing the viewfinder frame into thirds, both horizontally and vertically.
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The technique works well when you are photographing a relatively small subject surrounded by a large expanse of space or against a plain background. The visual weight of your subject balances the vast emptiness.
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Thirds divisions can also help you decide where to place the horizon. If you place it along one of the two frame divisions, you have a quick and effective shortcut for deciding how to arrange the composition.
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