The Formatt-Hitech 4 x 4" soft edge graduated neutral density 1.2 glass filter helps specifically darken skies and other bright areas of the image. The filter is densest at the edge and fades towards the centre, with a soft transition line between the density areas and the clear areas. By having only a portion of neutral density on the filter, you can selectively darken areas of an image whilst allowing the part of the image in the clear section to receive normal exposure. Neutral density filters do not affect the colouration of the image and the 1.2 density provides a 4-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 is compatible with the Formatt Hitech 100 mm filter holder and measures 4 x 4" / 101.6 x 101.6 mm. - Soft edge graduated ND 1.2 filter to darken skies and other bright areas of the image. - Provides a 4-stop reduction of light in selective areas. - The soft edge transition is ideal for situations where there is no distinct separation line between light and dark areas of the image. - Neutral density filters do not affect the overall colouration of the image. - Compatible with the Formatt Hitech 100 mm filter holder.