Well-suited to photographing sunsets and sunrises with flat or well-defined horizon lines, the 150 x 170mm Daryl Benson Reverse Graduated Neutral Density 0.9 Filter from Singh-Ray is a specialized graduated filter for selectively balancing high contrast situations. Compared to a traditional grad ND, this filter's 0.9, 3-stop density is in the center of the filter plane and transitions toward one edge while leaving half of the filter area clear to receive full exposures. This configuration is ideal for sunrises and sunsets where the brightest part of the scene is centrally located and is surrounded by a darker foreground and sky. The filter is constructed from optical resin that is both durable and helps to maintain high clarity, and it is compatible with the LEE SW150 filter holder.