The LEE85 Reverse 0.6 (2 stop) ND has been specifically designed to give photographers full control over images shot at the beginning and end of the day. They have a stronger density in the center of the filter, with a carefully designed transition zone that gives a natural, balanced exposure to the sky.Many landscape photographers will testify that controlling exposure at sunrise or sunset can be tricky. The strength of the sun means the sky can appear blown out, and trying to adjust the exposure can leave other areas in the frame underexposed. The Reverse ND helps balance the exposure for dramatic sunrise and sunset images. | Lee Filters | | LEE85 85x115mm Neutral Density 0.6 Reverse Grad Resin Filter | Best Buy