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Anonymous
I've used a super cheap Fotodiox CPL, a moderately priced Kenko one and once borrowed an expensive B&W CPL from a friend. The Fotodiox filter gives a distinct color shift, from green to slight magenta depending on the angle; it's clearly visible in the viewfinder, but has little effect on the result if you use auto WB and/or shoot RAW. The Kenko filter works as intended, but got smears on its the surface after it was exposed to rain and wiped with a cloth. These smears don't affect image quality, but I can't get rid of them either. No complaints about the B&W filter so far (well, there shouldn't be considering the massive price). I haven't used it in the rain, though.
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