For wider apertures or longer exposures\nThis ND4 filter reduce the amount of light entering the lens so wider apertures can be selected, which is perfect for portraiture to reduce depth of field. Subject appears crisp and clear while the background becomes a soft blur. Also widely used for photographs of waterfalls and other nature scenes to emphasize movement.\n\nFeatures:\n- Digital multi-coated;\n- Black almite frame;\n- Black rimmed glass;\n- Low profile frame;\n- Knurling edge frame;\n- UV protected case;