NiSi
Sigma 12-24mm f/4 Art Adapter
For Nisi 180mm Filter Holder
The NiSi Sigma 12-24mm f/4 Art Adapter is designed to allow the NiSi 180mm Filter Holder to be used with the Sigma 12-24mm f/4 Art lens with no vignetting in a full 360 degree rotation. The adapter is made from aviation-grade aluminium for durability and features a matte black frosted finish to reduce reflections.