As Mike suggests a UV filter will have very little effect on your photography if anything it may slightly warm the image. UV filters are used as lens protectors because of their negligible effect. Perhaps DSLR's auto white balance will negate any colour change if TTL sampling is employed. I use these filters on most of my lenses and its worth it, during a car journey with kit in a heavily loaded boot the lens cap off one of my lenses became detached and scratched all the filter. If no filter was used then these scratches would have been on the front lens element - totally ruining it.
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