And which ones? Any negative effects? The other day I shot a few test pics with an old polarizer from my film days. I guess there is some merit to when a filter says 'for digital' as the pics looked a bit crummy. I should have saved them for show and tell but I was a bit frustrated and formatted the memory card right away. Anyway, I've been wanting a circular polarizer and a few ND filters. Anything anyone recommends that's not quite in the B&W price range? It's been forever since I bought a filter (besides UV), so I'm not sure who the major players/best brands are these days.