Tech Support: Are filters making my pictures soft?

Question: Do UV or circular polrizing filters cause zoomed images to be blurred? I have done some unscientific testing using my Pentax K10D with Sigma 70-200mm f/2.8 II APO EX DG Macro lens and UV or circular polarizing filters. pictuers taken at maximum zoom are blurry if I use either of the filters, but they

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Question:

** Do UV or circular polrizing filters cause zoomed images to be blurred? I have done some unscientific testing using my Pentax K10D with Sigma 70-200mm f/2.8 II APO EX DG Macro lens and UV or circular polarizing filters. pictuers taken at maximum zoom are blurry if I use either of the filters, but they're significantly clearer with the bare lens. Is this result normal?

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