The 100x100mm Nano IR Neutral Density filter from Nisi is specially designed for landscape photographers. This filter is made from high quality optical glass (not resin) with nano coating to prevent losing any single bit of detail. Neutral density filters do not affect the coloration of the image and the 0.9 density provides a 3 stop reduction in light from entering the lens. This filter measures 3.9 x 3.9″ / 100 x 100mm and is compatible with the Nisi 100mm filter holder or other 100mm Standard Filter Holder (Lee, Cokin or Formatt Hitech).\n\nBy using neutral density filter the camera is vulnerable to infrared light which will cast the unwanted red color to the photos when shooting at small aperture. Nisi added the infrared protection coating layer to this filter which help to eliminate the infrared light through the lens to bring back the nature color.\n\n- Ultra Low Color Cast, Ultra Low Reflection\n- Provide 3-stop light reduction\n- No Vignetting\n- High Definition\n- Nano Coating on Both Sides, Water & Oil Repellent\n- Environmental Optical Lens glass(H-K9L)