Urth 67mm ND64 1000 (6 10 Stop) Variable ND Lens Filter (Plus+)The professional ND64 1000 Variable ND Filter Plus+ offers 6 to 10 f stops of light reduction, giving you more creative control in low variable light. By blocking 6 to 10 f stops, you can use larger apertures in bright variable light for smaller depth of field effects, and slower shutter speeds for long exposure effects without overexposing your images. The Plus+ series has 20 layers of nano coating that make cleaning easier and provide better protection against water, oil and scratches. These layers also provide higher maximum light transmission and a more consistent transmission curve for better light reduction. When used with very wide lenses, above f/9 the X effect may occur. Professional German glassLeading German B270 SCHOTT optical glass features a 20 layer nano coating for better light transmission, better protection and easier cleaning. Ultrathin edgeThe ultra slim edge prevents vignetting and is made of aluminium. Double threadAll filters have a double thread for stacking filters or using lens caps with screw mounts. About UrthFor every Urth product sold, trees are planted through Eden Reforestation Projects, including in the mangrove forests of Madagascar. That way, Urth helps restore forests where they are needed most.,Master bright variable lightLonger motion blurCut 6 to 10 f stops for stronger long exposure.Better depth of field, use wide apertures even in bright light.Warranty: 2 years