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About Tiffen 49mm 21 Filter
Product description The #21 Orange Filter from Tiffen is a filter designed to build contrast in black and white photography and creates separation between the tones. The filter absorbs blue and blue-green colors, rendering blues darker such as for skies in landscape or aerial photos and water in marine shots. The filter has a filter factor of 4.5, so you must increase your exposure by 2 1/3 of a stop to compensate. Tiffen filters are not dyed, but are manufactured by using ColorCore technology. This process laminates the filter material between two pieces of optical glass and grinds down and polishes the glass. The glass is then mounted to the metal ring, which after that can be screwed onto the lens for the desired effect. Strong contrast in B&W images Ideal for landscape, marine, or aerial photography Absorbs blue and blue-green colors Renders blues darker Amazon.com This filter renders blue tones, such as those in marine scenes, darker.
