I'm wanting to purchase a circular polarizer filter and was wondering what everyone would suggest to buy? I've tried to do a little research and think I've come to the conclusion that some of the better one's to get are Hoya, Heliopan and B+W??? Do you recommend these yourself? Are there any others that I should consider? I've also read a few things on HMC are better lens to get? Do they make that much of a difference with the extra coatings? Do I really have to buy a different filter for each lens I have if they are different sizes? I read something about buying the ?biggest? size needed and stepping it down? Can someone explain this to me? Anyone know of any good sites that might have any of these lens for a good price?