NiSi ND16 (4 Stop) Filter for the NiSi True Color VND Swift System that expands the NiSi True Color 1-5stop VND Variable Filter to a 5-9 stop VND when the bright conditions require more stops. The NiSi Swift System works seamlessly with the NiSi True Color 1-5 stop VND Variable ND filter allowing the capability to be expanded by adding extra filters simply by pressing them on the front of the NiSi True Color 1-5 stop VND Variable ND filter. Adding the NiSi ND16 (4 Stop) Filter for the NiSi True Color VND Swift System, the NiSi True Color 1-5 stop VND Variable ND filter is expanded to a 5-9 VND filter. The new multi-ti coating provides an anti-reflected waterproofing and offers 4 stops of full spectrum neutrality. It also has precise stopping capabilities with true color transmittance.