The BW Clear Glass XS-PRO Digital Filter fulfils the desire of many photographers for pure lens protection without a filter effect. Its only function is to keep dirt sand or splashes away from the front lens. The extremely clear special glass with high transmission is MRC-finished 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.