The Tiffen 4 x 5.65" Soft Edge Graduated 0.3 ND (vertical orientation) filter is a graduated neutral density filter that helps to specifically darken skies and other bright areas of the image. nnThe filter is most dense at the edge and fades to clear in the middle, with a soft transition line between the areas of density and transparency. Neutral density filters do not affect the colouration of the image and the 0.3 density provides a one-stop reduction of light entering the lens.nnThis filter is constructed from Water White glass and is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and polishing it flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 5.65" / 101.6 x 143.5 mm. nn- 0.3 soft edge graduated ND filter for darkening skies and other bright areas of the image.n- Provides a one-stop reduction of light in selective areas.n- Neutral density filters do not affect the overall colouration of the image.n- Water White optical glass for excellent clarity.