The NiSi ND-VARIO Variable 5-9 stops filters are the ideal tool for photographers who want to approach the world of long exposures and for videographers who want to be able to control the light in real-time during shooting, without introducing heavy artefact or aberration. NiSi has created a unique filter, allowing you to use a single filter to obtain a reduction of the light that enters the lens from 5 to 9 stops. The characteristics and quality of the filter avoid any “X” or “cross effect” from which variable ND filters often suffer. The unique lens grade optical glass that made the NiSi brand famous was also used for this ND Variable. Furthermore, there is the Nano Coating treatment which makes the surface waterproof and resistant to grease and dirt, so cleaning the filters has never been easier. NiSi ND Variable Nano filters are available in many popular sizes, from 40.5 to 95mm.