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The B&W Master 82mm High Transmission MRC Nano is a slimline multicoated circular polarising filter which uses best quality polarising foils and has a edge-sealed sealed Kasemann type mount to protect against dust and moisture. It diminishes or eliminates non-metallic reflections and intensifies colours (especially a blue sky). Loses between 1-3 stops of light depending on rotation point.
What's special about the Kasemann filter? The top quality polarising foils used in Kasemann type filters are neutral in colour and have a higher efficiency than conventional ones. They are cemented between high-grade optical glass. The resulting sandwich is then precision-polished again to achieve highly accurate plano-parallel surfaces. Subsequently they are edge-sealed to protect the foil against humidity.
MRC Multi Resistant Coating
Each side of the filter has 7 anti-reflection coatings plus a protective layer which ensure maximum reflection and stray light reduction (residual reflection of just 0.5%). This ensures brilliant colours and high contrast, and the elimination of ghost images caused by back reflection from the camera sensor.
Precision engineered mount
The 7mm deep brass mount is made on a CNC milling machine. The filter glass is held securely but without tension by a threaded retaining ring, and there is a front thread. Black hard-chrome plating with a matt black inside surface and engraved markings ensure long service.