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SIRUI Ultra Slim S-Pro Nano MC ND1000 Gray Filter - Prevents over-exposure, for effective photos 2-layer color fringe-reducing nano 22-layer anti-reflection nano-coating Ultra Slim aluminum construction prevents vignetting Lightweight but robust construction barely visible on the lens 1.5mm Schott glass produced in Germany 5x protection: Water and grease resistant, scratchproof, anti-static and anti-reflective Gray Filter/Neutral Density Filter The SIRUI Ultra Slim S-Pro Nano MC ND Filter reduces the quantity of light without altering the colors or contrast levels in the image. For bulb exposures during daylight, it is indispensable. If you want wiping or flowing effects, such as with running water, a slow shutter speed is required. Without a SIRUI gray filter, this would result in an over-exposed image. Neutral density filters are also suitable for working with an open shutter to produce low field depth. The increased light transmission would be compensated for by the filter. ND1000 / ND3.0 The SIRUI ND1000 Filter has a neutral density of ND3.0. This corresponds to a 1000 (or 1024) times lengthening factor or 10 f-stops. Nano Color Reduction The 2-layer nano coating reduces color fringing and ensures accurate color reproduction. Multicoated (MC) The 4-layer protective coating is anti-static, water- and oil-repellent as wel