The 0.6 graduated neutral density soft edge glass filter Formatt-Hitech 6.6 x 6.6" helps to specifically darken skies and other bright areas of the image. The filter is densest at the edge and fades to become transparent in the middle, with a soft transition line between the density and transparency areas. By having only a neutral density portion on the filter, you can selectively darken areas of an image while allowing the part of the image in the clear section to receive normal exposure. Neutral density filters do not affect image coloration and the 0.6 density provides a 2-stop reduction of light entering the lens. Formatt-Hitech glass filters are manufactured from high-quality Schott Superwite glass for exceptional clarity and maintained light transmission. This filter measures 6.6 x 6.6" / 167.6 x 167.6 mm. - 0.6 graduated ND soft edge filter for darkening skies and other bright areas of the image. - Provides a 2-stop reduction of light in selective areas. - The soft edge transition is ideal for circumstances where there is no distinct separation line between the light and dark areas of the image. - Neutral density filters do not affect the overall coloration of the image.