Polarizing Filter In Portrait. How To Remove Glare From The Face.
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How Filters Affect Your Photography | Photography Tutorial
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Photo101: Polarizing filters, why they're so neat...and how to use them
In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.