NiSi 150X150mm Square Neutral Density Filter, IR ND64(1.8), ND 6 Stops Coating Optical Glass Super Wide Angle Lens,Compatible 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 30mm and other Super Wide Angle Lens,compatible with Lee Cokin?Hitech?Singh-Ray? and other brand holder(Double sides coating+Hard Waterproof) The optical glass (H-K9L) is cured by a fine annealing process and a double sided optical grinding and polishing process help to ensure a quality high definition rating. NiSi filters are precision cut, polished and optically processed to allow for extreme flatness and high parallelism for the highest quality glass, image quality and image crispness. Nano attenuation coating,Water&oil repellent coating,Ultra low color shift,Ultra low reflection NiSi square IR ND filters are not only coated but we have also added a Japanese fire-proof foam gasket to ensure there is no light leakage.