Suitable For Any Camera Lens With 52mm Diameter Four main uses of an ND filter: To enable slow shutter speeds to be used to capture movement in subjects such as waterfalls, clouds, cars, seas, etc. To decrease depth of field by allowing wider apertures to be used, which help separate subjects from their background. To decrease the effective ISO of high speed film (ie: above ISO400) and allow it to be used outdoors in blight situations. To allow video cameras with fixed shutter speeds to film subjects such as snow, sand or other bright scenes which would normally cause over-exposure. Package: 1 x 52mm ND2 Filter 1 x 52mm ND4 Filter 1 x 52mm ND8 Filter