NiSi Sigma 12-24mm f/4 HSM ART Series Adapter for NiSi 180mm Filter Holder

• For use together with 180mm system Canon 11-24 filter holder
• Vignetting free using the 180mm system Canon 11-24 filter holder, even at 12mm
• CNC machined from a single block of aviation-grade aluminum.
• With 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