Zomei&reg; Ultra Slim HD 18 Layer Super Multi-Coated SCHOTT Glass PRO Fader Variable Density Neutral Gray ND X Lens Filter - 67mm This Variable Neutral Density filter reduces intensity of all wavelengths or colors of light equally, giving no changes in hue or color rendition. The purpose of standard photographic neutral density Neutral density can be adjusted from ND2 to ND400. Applies slow shutter speed under strong sunlight exposure. ND filter's edge glass are used Germany's high grade mat paint treatment, which avoid stray light and refract light come in, takes perfect image effect Environmentally friendly frame made of aircraft grade magnalium