HRT Circular Polarizer
- Uses a High Rate Transmission Polarizing Film
- Reduces Exposure 1.1 Stops
- The glass is UV absorbing to help improve contrast and color
The Hoya HRT Circular Polarizer-UV filter uses a High-Rate Transparency polarizing film that passes more visible light through the filter while still filtering the same amount of polarized light. The filter blocks only 1.1 stops of light which is around 2/3 to 1-full-stop better than a standard circular polarizer.
The glass of the HOYA HRT filter also has UV absorbing properties making the HRT a combination UV/circular polarizing filter. The most common use for a circular polarizer filter is to darken bright blue skies in outdoor photography, but they also can reduce or eliminate reflections from non-metallic surfaces such as glass and water. By rotating the outer ring of the filter the change of effect can be seen by looking through the filter or through the viewfinder if it is mounted on a camera.
Filter Factor: 1.1 stops Number of Multi-Coatings: Zero Hardened Top Layer: No Anti-Static: No Frame Construction: Standard Profile / Aluminum Front Filter Threads: Yes