The Tiffen 4 x 4" Hard Edge Graduated 1.2 ND filter 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 tapers to clear by the middle, with a sharp transition line between the dense and clear areas. 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.nnThis filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and polishing it to a tolerance of 1/10,000th of an inch. This filter measures 4 x 4" / 101.6 x 101.6 mm.nnnFeatures:nn- 1.2 ND hard edge graduated filter for darkening skies and other bright areas of the image.n- Provides a 4-stop reduction of light in selective areas.n- Neutral density filters do not affect the overall colouration of the image.nnnSpecifications:nn- Type: Graduated neutral densityn- Size: 4 x 4" / 101.6 x 101.6 mmn- Filter Factor: 1.2 (4 stops)