The 55mm Circular Polariser (CPL) Filter is a slim polarizing filter designed to control reflections from non-metallic surfaces such as water, glass, and leaves, while enhancing color saturation and contrast (for example, making skies bluer and leaves richer) in outdoor photography. It is designed to fit lenses with a 55mm front filter thread. The filter features a rotating aluminum frame that allows you to adjust the intensity of the polarization effect and helps prevent vignetting when used with wide-angle lenses. It uses high-quality optical glass and is multi-coated for resistance against scratches and water. The filter is suitable for both digital and film cameras and is ideal for outdoor, landscape, and travel photography.