Rodenstock 505211 52mm Slim UV Haze Aluminum Mount Multi-coated Red Label Filter (Black/Transparent) Cuts out all disturbing UV thanks to the steep absorption edge, while still transmitting over 97% of violet light and more than 98% in the remaining visible range which provides for ideal neutral color reproduction, eliminating bluing and color distortion Can remain in front of the lens at all times as a protective filter with hardened glass and a scratch-resistant coating High-quality optical glass and perfectly plan parallel surfaces with extremely smooth polishing, equal to the best lenses, ensures no loss of sharpness with maximum contrast The extremely thin, but very strong black anodized aluminum mount allows for photos free of vignetting with most wide-angle lenses Mount has front thread for a lens hood and a lens cap.