This Red Diamond ND filter is a 100x100mm filter that can be used in the HAIDA 100 Series / HAIDA 100-PRO Series holders or similar 100x100mm holders from Lee, Cokin, Hitech The Red Diamond series are the strongest filters we have made from optical gl so far! Through a fusion of the Nanopro technology and a special hardening process of the optical gl we have made a filter that is twice as strong. This Red Diamond filter is therefore much less sensitive to shocks and gl breakage Made of special optical gl and provided with a wafer-thin Nanopro multi-coating that protects the filter against scratches, water, oil and fingerprints. The filter is also easy to keep clean The filter has no detrimental color cast (Color Cast) and belongs to the elite of the ND filters R5 round design of the filter angles ensures easy handling of the filters The Red Diamond is the choice of the professional photographer or the amateur photographer who strives for optimum quality in their photography and materia