The LEE Filters - Neutral Density Grad Resin Filter 0.6 (HARD Edge) is a professional quality graduated filter withHARD graduation. TheHARD graduation is the standard for general landscape work. A 0.6 ND graduated filter reduces the brightness of the sky by 2 stops, foreground exposure is unaffected.The Lee Filters range of true, neutral density (ND) graduated filters enables the photographer to selectively adjust exposure across the frame without affecting colour balance. ND Grad Filters are truly the essential filter for the landscape photographer. The most common use for ND grad would be to balance the exposure difference between the sky and the foreground, retaining the natural colours and detail without over-exposing and "burning out" part of the image. They are available with a hard or soft graduation.LEE offer an incredible array of professional quality technical and effect colors, providing photographers and videographers the ultimate in creative control. These filters are manufactured by hand from a durable optical resin. All LEE filters are manufactured with the highest quality, optically pure base materials, and must comply with LEE Filters' strict quality control standards.The Lee Neutral Density 0.6 Hard Grad filter enables the photographer to selectively adjust exposure across the frame without affecting colour balance. The filter is partially clear, and partially 0.6 Neutral Density (2 stops), allowing the transition to be blended into the scene. This filter is the ideal tool for landscape photographers looking to control and darken the brighter parts of a scene, such as the sky. ND Grad filters are available with soft or hard transitions from dark to clear. As a general rule, a hard grad would be used for images containing a horizon, or any hard transition between the sky and the foreground - even with jagged or mountainous horizons, the exposure can be controlled far easier with a hard grad. Lee graduated Resin filters are 100 x 150mm and 2mm thick.