From Website Description:
The “high-end” polarizing foils of the Käsemann-type filters are neutral in color, they have a higher efficiency than conventional polarizing foils and they are cemented between high-grade plano-parallel 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. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to be the very best of all polarizing filters. They are well suited for applications that require the highest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses.
The B+W HTC Kaesemann C-Pols, in F-Pro and thin XS-Pro mounts, are the latest polarizers from B+W. HTC stands for High Transmission Circular
Filter is in Pristine Condition and comes in a hard shell case for protection. It's hard to take any photos of a filter to be effective but if you need, I'll try and upload any for you. Asking $60.00 plus whatever the shipping to you may be.
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