The Hoya 82mm Hrt Circular Polarizer Glass Filter is a cutting-edge tool for photographers, designed with High-Rate Transparency (HRT) film. This innovative technology allows more visible light to pass through the filter, while maintaining the same level of polarized light filtration. As a result, the Hoya HRT circular polarizer filter can transmit up to 25% more light through the polarizing film, providing photographers with approximately 1/3 stop more light than a standard circular polarizer. This advanced polarizing film is also utilized in the latest Hd Lcd TVs, demonstrating its high-quality performance. The glass of the Hoya HRT filter is not just a polarizer but also a Uv absorber, making it a versatile combination Uv/circular polarizing filter. The most common application for a circular polarizer filter is to darken bright blue skies in outdoor photography. However, it also has the ability to reduce or eliminate reflections from non-metallic surfaces such as glass and water. By simply rotating the outer ring of the filter, photographers can observe the change of effect either through the filter itself or through the viewfinder when it's mounted on a camera. As the world's largest optical glass manufacturer, Hoya produces glass to spec for almost every camera and lens manufacturer. They are also recognized as the world's largest filter manufacturer, ensuring the 82mm HRT Circular Polarizer Glass Filter is a product of unparalleled quality and performance..