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UV filters arn't really needed on DSLRS as UV light is already filtered in camera so besides using a screw in filter to protect the end element they don't really serve a purpose anymore
on the other hand polarizing filters can be very useful for eliminating reflection and allowing the sky to have much better contrast
i would leave the UV filter out of the equation all together and just use the polarizer if it suites the purpose
if you do want to use a filter for protection UV are usually the weapon of choice but lenses in general have much tougher coatings nowadays and don't scratch as easily
lens hoods do a good job at keeping things away from the front element and are far more useful i would stick with one of those
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