Neutral Density Graduated Filters
Quite often the correct exposure for a background in a scene is not the best one for the foreground or viceversa. The most common problem is that the bright sky is reproduced perfectly while the landscape is underexposed; in fact pitch black most of the times.
These are the occasions where the color and neutral density (ND) graduated (grad) filters can make the difference between a bad image, a good image and a better one.
As per these sunset examples, the problem can be solved by placing a "grad" filter, neutral density or colored, in front of the lens.
The brightness of the sky is then reduced without affecting the correct exposure of the landscape.
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