The BW UV-Haze XS-PRO Digital Filter blocks the invisible UV component of light from the sky which can cause blur & to which many colour films react with a blue cast. UV Filters are ideal for photography in high altitudes by the sea & in regions with very clean air. Photographs gain brilliance & blue casts are avoided. Because the glass is colourless colour rendition is not altered & no increase in exposure is required. That makes a UV Filter suitable for protection of the lens against dust flying sand sea water spray & the like & it can be kept on the lens at all times. It is recommended for analogue colour & black-&-white as well as digital photography. BW XS-Pro Digital Filters main features. b Extra-Slim Mounting Rings that Eliminate Problems Associated with SLR Wide-angle & Telephoto Imagingb BW XS-Pro filters employ a newly developed mounting ring that is especially suited for SLRs with wide angle & zoom lenses. The extremely thin design prevents the mounting ring from vignetting in even the widest shots. BW XS-Pro Digital Filters have front threads for mounting additional accessories such as filters screw on shades & lens covers. XS-Pro filter rings are made from brass & are matt black to prevent reflections. b Schneiders Proprietary MRC Coatingb MRC refers to the unique Multi Resistant Coating developed by Schneider-Kreuznach which comes as standard on BW XS-Pro Digital Filters. It provides perfect anti-reflection brilliant colours & high contrast. Only Schneider lenses & BW filters are protected by this extremely resistant multi-layer broadband coating eight layers on both sides. In addition the scratch-resistant water- & dirt- repellent outer layer makes it easier to clean the glass surface. Due to its low residual reflection 0. 5 MRC prevents ghosting or double images which can be caused by return reflections from sensors.