Zomei Ultra Slim HD 18 Layer Super Multi-Coated Schott Glass PRO Density Neutral Gray ND1000 Lens Filter - 77mm Germany Schott Optical Glass, double side 18 layer multi-coating, high definition 2.3mm ultra slim frame design, avoid dark corner, ideal for wide angle lenses 10 Stop exposure correction enables you to control the depth of field and movements more easily 3.0 density creates a darkening of the image, allowing you to shoot with a longer shutter speed or wider aperture Set your white balance properly to have better color balance. Protect lens from dust, oil, moisture, fingerprints and scratches