The NiSi NIC-66-NGT is a matte box compatible yellow light filter. Yellow light blockers are used to reduce or eliminate the yellow haze often seen as a result of light pollution, making these filters superb for nighttime cityscapes and astrophotography.
Each filter has a spacial Nano coating on both sides, protecting against scratches and oils and making the filter waterproof. This coating also cuts down reflections and has virtually 0 color cast.
The Natural Night Filter removes approximately 1 stop of light.