Zomei Slim Neutral Density Filter 67mm ND1000 Optical ND 10-Stop Filter for Camera Lenses This Zomei Neutral Density Filter ND1000 reduces the light by 10 f-stops. Optical Multi-Coated Filter. Greatly reduces the appearance of lens flare and ghosting caused by reflections Knurling Edge Frame. These filters are equipped with a straight knurling edge for non-slip, easy attachement and removal situations when a narrow depth is field is needed. Neutral Density Filters are often used to achieve motion blur effects with slow shutter speeds Not only is using an ND great for creative water shots but also for any image where there is movement, such as cityscapes with people and traffic moving or where clouds are moving through an image. Using an ND filter will open up new and exciting ways of looking at the world around you.