Exposure control switches on/off highlighting too light and too dark areas on the preview.
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Exposure is the amount of light hitting a photosensitive material of the camera during a certain period of time.
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Correct exposure is such amount of light that makes the largest number of color as bright as possible in a photo.
Too light image areas are highlighted in green, too dark areas are highlighted in red.
The exposure control helps photographer to choose lighting for shooting to avoid darkened or lightened image.