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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 534550" data-attributes="member: 13090">Hoya HD's are the ones I use. The HD filters use a harder glass than most filters (Hoya claims the glass is 4x stronger than what's commonly used, if memory serves) and last I heard Hoya is the world's largest maker of optical glass so I would feel safe in assuming they know what they're doing.The thing I like best about the HD's is that you only lose about one stop using them. By comparison the Nikon-branded CPL, which I think is a fine filter, loses 1-1/2 stops, while run of the mill polarizers lose a full two stops of light on the regular. Hoya HD's also clean up easier than any other multi-coated CPL I've used.</blockquote>