The 6.5 x 8" Soft Edge Graduated ND Filter Kit from Formatt Hitech has several uses and offers the possibility to achieve otherwise unachievable results. This kit contains one 0.3, one 0.6 and one 0.9 Graduated Neutral Density filter. These filters enable the shooter to adjust exposure without affecting color balance. A Graduated ND filter appears gray and reduces the amount of light reaching either the sensor of a digital camera or the film plane of a traditional film camera. It is clear at the bottom with a gradual transition to darker gray at the top. Primarily, this filter is used to control exposure when shooting bright landscapes where your horizon line displays a great exposure difference between sky and foreground, and you need to balance them out for a pleasing exposure.
Ultimately, its value is in helping to prevent bright, overly washed out images shot in bright light. These filters are made from CR39 resin and are produced to exacting tolerances that permit you to change filters mid-shoot or from day-to-day and know that your image quality will remain consistent.