Urth 77mm Magnetic ND1000 (10 Stop) B270 Schott Optical Glass Professional Lens Filter Plus+ (Black)The Urth 77mm Magnetic ND1000 (10 Stop) Lens Filter Plus+ easily snaps in place, providing a fixed 10 f stop light reduction for better control with long exposure and motion blur techniques in bright light. Shallow Depth of Field The Magnetic ND1000 Filter Plus+ brings ease to your creative flow with a convenient, stackable, magnetic system. With less light entering your camera, you can also use wider apertures in bright light for a beautiful