The main reason why professionals use lens hood during photography is to avoid unwanted strong light coming into the lens path (direct or indirect rays). If these ray reaches the image element in the camera it causes flares and low contrast images. Flares in some cases are so strong that they can spoil the image either partially or fully. By avoiding undesirable light getting in the path you would actually increase the contrast and crispness of your image. Lensflare is not a deriable effect in photography. Atleast not in the traditional sense of photography. The other good reason to use a lenshood is physical protection.
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