Tiffen 77mm Circular Polarizer Filter
Professional photographers have a love-hate relationship with Tiffen. Many of the company's filters have been much maligned, but their multi-coated circular polarizers are absolutely phenomenal. The Tiffen Digital HT Multi-Coated Circular Polarizer is the best circular polarizer Tiffen offers.
Boasting a 10-year warranty, the Digital HT Multi-Coated Circular Polarizer offers very high light transmission, which means this filter should impact exposure only minimally. These filters are coated against flare and scratching. The filter's exterior coat, on both sides, is also easy to clean. The Digital HTs have all the features you've come to expect from top-of-the-line products.
Tiffen use what they call ColorCore glass for this filter, which is optically pure and from a proprietary formula closely guarded like the Coca-Cola recipe. They take this very seriously and why not? ColorCore glass performs extraordinarily well against similar, upper-market products from industry luminaries like B+W and Hoya.