• Vignetting free using the 180mm system Canon 11-24 filter holder even at 12mm

• Use the 180mm system Canon 11-24 filter holder also on Sigma 12-24mm F4 lens

• CNC machined from a single block of aviation-grade aluminum.

• With the matte black frosted finish on the surface.Gasket to prevent any light leaking.

• The 180mm System Holder for the Canon 11-24mm 4.0L is sold separately and not included

The NiSi Sigma 12-24mm f/4 HSM Art Series Adapter for NiSi 180mm Filter Holder made from aviation-grade aluminum and is compatible with the NiSi 180mm Filter Holder For Canon 11-24mm to allow the use of the NiSi 180mm System on the Sigma 12-24mm f/4 HSM Art Series lens with NO vignetting in a full 360-degree rotation.

This adaptor ring MUSTbe used with theNiSi 180mm Filter Holder for the Canon 11-24mmto allow the NiSi 180mm filter system to be used with theSigma 12-24mm f/4HSM Art Serieslens.