The Hoya HD Nano Mk II CIR-PL Filter is a premium circular polarization filter designed to improve image quality by reducing of reflections and increasing color saturation. This filter is made of high quality optical glass coated with an advanced HD Nano coating. This coating provides exceptional scratch resistance and makes cleaning easier. The ultra-thin filter mount prevents vignetting, even with wide-angle lenses. The Hoya HD Nano Mk II CIR-PL filter is ideal for landscape and architectural photography as it eliminates unwanted reflections on non-metallic surfaces and makes the colors appear more intense and contrasty. Robust, durable and easy to use, this filter is a valuable addition to any camera equipment.