In conditions of extreme light intensity, such as sunshine on snowy mountains or on the beach, or when using a camcorder, Neutral Density filters are recommended as essential. Neutral Density filters are often ignored by photographers, but they have several uses and offer the possibility to achieve otherwise unachievable results. Neutral Density filters appear grey and reduce the amount of light reaching the film or imaging sensor, they have no affect on color balance. The ND4X reduces light transmission by 2 stops. 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 aid in reducing stray light and unwanted 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 and removal.