Hoya 55mm DMC PRO1 Digital Multi-Coated CIR-PL Filter. [Camera] Designed and engineered for Digital SLR Cameras and Lenses to serve as a lens protector and to reduce the adverse effects of ultraviolet light Digital Multi Coated (DMC) -- Greatly reduces lens flare and ghosting Black Almite Frame (BAF) -- Black matte finish aluminum frame reduces reflections Black Rimmed Glass (BRG) -- Reduces light reflection around the filter edge to enhance contrast Low Profile Frame (LPF) -- Ultra thin frame helps avoid vignetting on wide angle lenses and Knurled Edge Frame (KEF) aids easy attachment and removal Minimizes Bluish Cast / Protects Front Element