The PROMASTER Digital UV/IR Cutoff filter blocks undesirable ultraviolet and infrared rays that may interfere with obtaining the best image possible with a digital sensor. This filter leads to sharpener and clearer images, reducing ghost images caused by IR radiation and the high sensitivity of camera sensors to this spectrum of light which has a negative impact on image sharpness. Using this filter will mean greater detail, more natural colors and finer color gradation. It also serves as a permanent lens protector. Digital Anti-Reflection Multi Coating ? Specially formulated to pass light reflected off of a digital camera?s anti aliasing filter and silicon based CCD or CMOS sensor. Black Almite Frame and Black Rimmed Glass ? The black matte aluminum satin finish almite frame and black rimmed glass help reduce stray light and reflections. Low Profile Frame ? Ultra thin low profile frames prevent vignetting on super wide digital format lenses. Knurled Frame Edges ? Frames feature a knurled edge frame for easy attachment.