I always leave a UV filter on my lenses at all times for protection. I put the Circular Polarizer on top of that as needed, though having both at once can darken or distort the edges of your photo.
I believe most modern DSLR lenses are coated for UV, but I don't see having the UV filter as a downside.
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I believe most modern DSLR lenses are coated for UV, but I don't see having the UV filter as a downside.