• The adapter (single piece) is required when using NiSi 150mm S6 Square Filter Holder with Sigma 14mm f1.4 DG DN lens • Flares and ghosts that are prone to problems with filtering work with ultra wide angle lenses. We solved the internal reflection from the lens adapter which is one of the causes by lining the non-reflective planted blanket. The occurrence of internal reflection has been significantly improved than traditional matte paint • NiSi S6 holder can be used with multiple lenses by replacing lens adapters • Combine with special filters sold separately, you can create a variety of filter work • The filter compatible with this product is only a circular filter for S6