The NiSi 150x150mm Nano IR Neutral Density Filter 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 colouration of the image and the 3.0 density provides a 10 stop reduction in light from entering the lens. This filter measures 150mm x 150mm and is compatible with any Nisi 150mm filter holder. By using neutral density filter the camera is vulnerable to infrared light which will cast the unwanted red colour 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 colour.