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Adjustable ND Filter Feature Neutral density can be adjusted from 3 to 7 stops, easy to create different neutral density by rotating the ring. The front diameter is larger than the back diameter of this filter , which is specially designed to avoid vignetting at wide angle lens. Allows the use of slow shutter speeds, with high speed films or digital cameras, to record movement/image blur in subjects. Decrease the depth of field by using wider apertures, which helps separate subjects from their background. Nano Coating In addition to state-of-the-art MRC, our optical engineers developed new nano coating layer technology, called nanotec, from the ground up to repel dirt, water and other elements by beading rather than absorbing and smearing. Set in our workhorse and built to withstand extreme wind, salt water, dust and other abrasive conditions and elements.