I plan to invest more time in Landscape photography and like to get me for that reason a CPL filter from HOYA for my Tamron lens. I found a few on ebay the only think I am not shure about is that some cost like 30 bucks and other are around 80 bucks, they are all from Singapure or South Korea and are all includet free postage.
Have I to watch out for aftermarket filters with the same name or should they all be originale HOYA filters? I mean it is almost 50$ difference in the price. If I can safe 50 $ it would be great I am just worried that the cheaper ones are not real HOYA filters! Could that be possible?