To enable slow shutter speeds to be used to record movement in subjects such as waterfalls?∨ clouds?∨ cars?∨ etc.Features:This Photo filter is compatible with 55mm lenses.Apply slow shutter speed under strong sunlight exposure?∨ large aperture is available to create depth of field easily.The number indicates the fraction by which light is reduced; ND8 cuts the light entering the lens by 1/8.To enable slow shutter speeds to be used to record movement in subjects such as waterfalls?∨ clouds?∨ cars?∨ etc.Specifications:Material of filter: Optical resinPackage size: 7 * 8.5 * 1.5cm / 2.8 * 3.3 * 0.6inPackage weight: 37g / 1.31ozPackage List:1 * ND Filter"