Helping to balance exposure when working in high-contrast situations, the 150 x 170mm Soft Graduated Neutral Density 0.9 Filter from LEE Filters is specifically designed to selectively control brightness in difficult lighting. The filter's design places the 0.9, 3-stop density at the top of the filter and then transitions to clear by the center of the filter for a gradual, natural appearance. The soft-edge transition between the density and clear areas is well-suited for photographing scenes with an indistinct or undefined horizon line, as well as when working with wide-angle lenses. This filter is constructed from optical resin that is both durable and helps to maintain high clarity, and is compatible with the LEE SW150 filter holder.