Sunpak’s popular line of Circular Polarizers and Filters help you improve image impact and quality The Sunpak 58mm Circular Polarizer (CPL) is meticulously crafted from the high-quality multi-coated optical glass optimized for today’s cameras. And they are backed by a one-year warranty against defects in material and workmanship. Circular Polarizer reduces reflections, intensifies colors and deepens sky for dramatic images. The multi-coated circular polarizer reduces reflections from non-metallic surfaces and cuts through haze so that you can increase color saturation and contrast and deepens the color of the sky when used for landscape images. Also useful when shooting window scenes and water by greatly reducing or eliminating reflections. The durable low-profile aluminum-magnesium alloy filter ring construction is ideal for wide-angle lenses and telephoto lenses.