NiSi Glass 100X150mm Nano Multicoated Graduated IR Neutral Density 0.9 Hard Edge Filter (3-Stops) Can be used for Canon 16-35,Canon 24-70,Nikon 24-70,NiKon 70-200 and other 52mm,55mm,58mm,62mm,67mm,72mm,77mm,87mm lens,compatible with Lee Cokin Hitech Singh-Ray and other brand holder(Double sides coating+Hard Waterproof) High Definition: The glass is fine annealing environmental protection optical glass H-K9L, it is specially used for optical lens.Double sides optical grinding and polishing to make sure the high definition of glass. Glass can bear extreme environment, but resin and glue line will deform in high and low temperature, which will influence the parallelism. Ultra Low color cast: NiSi GND adopts our exclusive research and development gradual coating, the light from ultra violet to near-infrared light can pass through evenly. NiSi glass GND is durable, but the color of resin will fade, and glue line will easily come unglued. Anti-glaring: Double sides anti-reflection coating,can avoid high reflection of metal film such as aluminum or chromium film. Double sides water-proof, anti-glaring and reflection coating,can lower the reflection and make the filter easy to clean. World's first Nano coating square optical gradient filter. It's made from environmental optical glass (H-K9L). Double sides optical grinding and polishing to make sure the optical high parallelism and smooth to ensure the high sharpness of image.