Designed for use with NiSi Swift System Allows a filter designed for the NiSi Swift System (same filter thread size) to be used directory on the lens without the NiSi True Color 1-5 Stops VND The Swift System filters attach to the adapter ring simply by pressing them onto the front of the adapter Aluminum Construction Designed for use with NiSi Swift System Allows a filter designed for the NiSi Swift System (same filter thread size) to be used directory on the lens without the NiSi True Color 1-5 Stops VND The Swift System filters attach to the adapter ring simply by pressing them onto the front of the adapter Aluminum Construction