The 77mm UX Circular Polarising Filter is used to increase colour saturation, darken skies so white clouds stand out, and eliminate reflections from non-metallic surfaces like glass or water. It will also reduce the softness in scenery caused by atmospheric haze. Circular polarisers are designed to be used with the metering systems of modern SLR and digital cameras and will not change the overall colour balance of a photograph.

The Hoya 77mm UX Circular-Polarizer Filter has a slim aluminium alloy filter ring and is made of special optical glass for optimum clarity. Eight layers of anti-reflective coatings have been applied to further avoid ghosting and reflections, with the added advantage of helping to prevent unwanted minor scratches. It also has threads on the edges of the filter to allow for the attachment of additional filters.