Right now I am planning on buying a polarizing filter for my EOS 300D - EF 100-400L combo and a soon-to-come EOS 300D - EF 17-40L combo. Doing some research I found out that there are "circular" polarizing filters and "linear" polarizing filters. The price-difference is not very dramatic, so I was wondering what the actualy difference between the two polarizers might be. Maybe someone can explain this to me, please. Which one should I get for my camera-lens-combination.
Thank you very much in advance, I really appreciate your help!