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I started out with UV filters on all of my lenses "for protection". I also always use a hood. Found the hood protects the lenses enough, and I get better contrast without the UV filter, so now I don't use UV filters at all. I have never scratched a lens, but have bumped the hoods ocassionally.
I have the Hoya Pro1 CPL.
Keep in mind that the 70-200 f/4L has a reputation of being one of the sharpest zoom lenses available. You'd be hard pressed to find any zoom lens as sharp as it. The 10-22 is also no L series lens, and it won't be sharp wide open, but for landscapes you'll likely be shooting f/11, f/16 or smaller.
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