The Tiffen 4 x 5.65" Soft Edge 0.9 neutral density graduated filter (vertical orientation) is a graduated neutral density filter that helps to specifically darken skies and other bright areas of the image. The filter is densest at the edge and fades to transparent in the middle, with a soft transition line between the dense and clear areas. Neutral density filters do not affect the colouration of the image and the 0.9 density provides a 3-stop reduction of light entering the lens.nnThis filter is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding 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.nnnNote: The transition line of a vertically oriented filter is parallel to the short side of the filter.nnn- 0.9 ND graduated soft edge filter for darkening skies and other bright areas of the image.n- Provides a 3-stop reduction of light in selective areas.n- Neutral density filters do not affect the overall colouration of the image.nnnSpecificationsnn