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I don't use UV filters on any of my lenses.
My thoughts: I use high end lenses and I have hard time putting another piece of lesser quality glass in front of my $1k+ high quality lens glass. I use lens hoods for all my lenses and that has been enough. The cost of 4-6 good UV filter ($500-$600) is more expensive then a low deductable insurance policy.
Anytime you put something in front of your lens that wasn't designed to be there, you run the risk of increased flairing and actually reducing the contrast in your photos.
With wide angle lenses, be carefull on what you put in front of the element. It may cause some vignetting. If you want to still get a UV for it, make sure you get a really thin filters as this will help reduce the likelyhood of that happening.
if the filter has front treads as well why dont you put it in between your camera and your w/a lens? that way you never have to take off your filter. but would this cause vineggiting (sp)?