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Anonymous
AFAIK UV and protection is same thing when put on dSLR camera. Film had some issues with UV light. B+W MRC is as far as I know the best filter, it has coating that's resistant to scratching, they claim it's more resistant than glass.
BTW, when you buy a 1500 USD lens, I think that it's bad idea to degrade it's quality just to save few bucks on filter. I use B+W, standard, not MRC, and it works very well. If you use wide angle lens, than slim version is a good choice, to prevent light-falloff. However, on my 10-22 I don't see any vignetting, unless I stack UV+CPL.
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