About GREEN.L GREEN.L has been a leading manufacturer and supplier of photographic filters and lens accessories for 22 years. The company has a rich history of innovative product design, superior optical consistency and unparalleled quality.GREEN.L have been working closely with many well-known brands for their OEM product.Feature When the picture is too bright, you may not be able to shoot at the slow shutter speed you need. In this case,Neutral Density filter function can reduce the amount of light and avoid overexposure The ND1000 Filter can reduce the light entering the lens by 10 stops, it will record anything in the image that is moving and cause it become blurred To achieve your very own spectacular images, try shooting scenes that include clouds, waterfalls, rivers or even moving people or vehicles. It has a low-profile aluminium ring to avoid vignetting and is double threaded to aid filter stacking.Specification Material of Filter: High quality optical glass Material of ring: T6061 aerospace aluminum alloy Size of filter: 49mm double thread Filter Density: ND3.0 or ND1000 Stop reduction: 10 StopPackage including 49mmND1000 filter × 1 1x Lens Protective Case