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The best CPs I've had are the Hoya HDs. They are very thin, clean easily, turn smoothly and don't impart weird color casts. I've had no problems with scratching, and they are claimed to be much more break-resistant also, though I haven't had occasion to test that and don't plan to. I haven't used the high-end B&W (Kaesemann) filters, but the lower-end B&Ws are unimpressive to me. Similar in price to the better Hyas, but not good mechanically - very sticky to turn and prone to getting stuck, despite being brass, and the thin models have no front threads.