NiSi 72mm Swift True Color VND Kit 1-9 stops (1-5 Stops VND + 4 Stop ND) - When using NiSi True Color VND 1-5 stop filter together with the NiSi Swift system ND16 (4 stop) filter, you get a 5-9 stop variable ND-filter. Just push them on, simple as that! NiSi True Color VND 1-5 stop filter can be used on lenses down to 16mm focal length (Full Frame) without vinjetting. NiSi True Color VND 1-5 stop filter in combination with NiSi Swift system ND16 (4 stop) filter can be used on lenses down to 18mm focal length (Full Frame) without vinjetting NISI FILTER ND-VARIO 1-5 Stops True Color is a variable neutral density filter that provides an exposure reduction of 1 to 5 EV. The density, ND factor, is stepless controlled by turning the filter. The degree of density is easily controlled by rotating the front filter ring with or without the included silver lever, helping you predetermine the additional exposure length required. This filter have built in stops when turning to end positions,