HOYA HRT High Transparency Filter

This filter utilizes a newly developed High Transparency film that allows more visible light to pass through the filter while maintaining the same amount of polarized light. The HOYA HRT circular polarizing filter transmits up to 25% more light through the polarizing film, giving the photographer approximately 1/3 stop more light than a typical circular polarizer.

UV Absorption

The glass of the HOYA HRT filter also has UV absorption properties, making the HRT a combination of UV filter/circular polarizer. The most common use for a circular polarizing filter is to shade bright blue skies in outdoor photos, but it can also reduce or eliminate reflections from non-metallic surfaces like glass and water. By rotating the outer ring of the filter, the change in the effect can be observed by looking through the filter or through the viewfinder if it is mounted on a camera.