New product
The NiSi adaptor for Sigma lens allow to could use NiSi holders with this lenses. It features a lightweight, aluminum-alloy construction that has a corrosion-resistant, black anodized finish for durability.
The adaptor ring for the Sigma 12-24 f4.5-5.6 lens MUST be used with the NiSi 150mm Filter Holder For Nikon 14-24mm f/2.8G
The adaptor ring for the Sigma 12-24 f4 lens MUST be used with the NiSi 180mm Filter Holder For Canon 11-24mm f/4