. This Red Diamond MEDIUM graduated ND filter is a 150x170mm gray gradient filter that can be used in the HAIDA 150 Series filter holders or in similar 150x150mm filter holders from Lee, Nisi, Cokin, Hitech. Made from optical glass, with a Nanopro coating and hardened through a specific production process makes this filter the most durable in the entire Haida filter range. The wafer-thin nanopro coating protects the filter against scratches, water, oil and fingerprints. The filter is also easy to clean because of the coating. The Red Diamond is very resistant to shocks and glass breakage. An R5 rounding of the filter angles ensures excellent handling when placing in a filter holder. The filter has no detrimental color cast (Color Cast) and belongs to the elite of the Graduated ND filters. This Graduated ND filter is ideal for use in landscape photography. The Red Diamond series is the choice of the professional photographer or of the photographer who strives for optimum quality and durability in his choice of materials.