NiSi ND Filter for True Color VND and Swift System (77mm, 4-Stop)

Introducing the NiSi ND16 4 Stop Filter for the NiSi True Color VND Swift System that expands the NiSi True Color 1 to 5 stop VND variable filter to a 5 to 9 stop VND when the bright conditions require more stops.
Expanded Capability
The NiSi Swift System works seamlessly with the NiSi True Color 1 to 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 to 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 to 5-stop VND variable ND filter is expanded to a 5 to 9 VND filter. Or use the NiSi ND16 4-stop filter for the NiSi True Color VND swift system with the optional adaptor ring that is sold separately and attach it directory to a lens.
Waterproof
The new multi-ti coating provides anti-reflected waterproofing and offers 4 stops of full spectrum neutrality. It also has precise stopping capabilities with true color transmittance. Stacking multiple filters can introduce vignetting when shooting with wider focal lengths. See the suggested focal lengths below to avoid vignetting.
Swift in Video Mode
True color 1 to 5 Stops VND plus 1 swift filter results in no vignetting at 18mm full frame. True color 1 to 5 Stops VND plus 2 swift filters results in no vignetting at 20mm full frame.
Swift in Photo Mode
Vignetting can vary from lens to lens based on design, breathing, and focus distance. True color 1 to 5 stops VND plus 1 swift filter equals no vignetting at 20mm full frame. True color 1 to 5 stops VND plus 2 swift filters results in no vignetting at 28mm full frame.