Sirix Digital Circular Polarising Filter is an all-weather and multi-purpose lens protector made for use with DSLR cameras. This filters main purpose is to reduce reflections and improves saturation which often makes outdoor photography hazy. Using this filter, reflections on water, windows and other objects and glare can be reduced significantly from non-metallic surfaces. This filter is available in 37mm size. Product Features in Detail A multi-purpose fine-weather filterThis filter absorbs the ultraviolet rays that reduces reflections coming fron water reflections, windows, and other non-metallic surfaces.