NiSi 150X170mm Square Soft Graduated Neutral Density Filter Nano GND8(0.9),ND 3 Stops Coating Optical Glass for Super Wide Angle Lens,compatible with Lee Cokin Hitech Singh-Ray Can be used for Nikon 14-24 Lenses,Tamron 15-30mm Lens,Canon 14 Lenses,Sigma 12-24mm lens,Canon TS-E 17mm f/4 ,Zeiss 15 2.8/T*,Samyang 14mm,Hasselblad 95mm/86mm Lens,Schneider&Phase One 28mm and other Super Wide Angle 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.