The Formatt-Hitech 165 x 200mm Firecrest Graduated ND 1.5 Filter helps to darken specific areas of an image, such as bright skies, while allowing for a normal, unaffected exposure in the other regions of the image. The filter is densest at the edge and tapers to clear by the middle, with a soft-edged line of transition between the density and clear areas. Neutral density filters do not affect the coloration of the image and the 1.5 density provides a 5 stop reduction in light from entering the lens.
Applied to the outside of the Schott Superwite glass construction is a 15-layer Firecrest multi-coating, which helps to minimize reflections and flare in order maintain truer colors and contrast. The multi-coating is also scratch-resistant and hydrophobic to benefit the overall durability of the filter. This filter measures 6.5 x 7.9" / 165 x 200mm and is 0.08" / 2mm-thick, making it compatible with the Lucroit 165mm Filter Holder. Its vertical orientation indicates that the density's line of transition runs parallel to the short side of the filter.