OK, I ran some tests. I won't post the pictures but here are results.
The first thing that I learned is that automatic focus/auto exposure gives me a disappointing result regardless of filter or no filter. When I switched to full manual exposure and focus I found a slight improvement when shooting without the filter. Camera Canon 20D. Lens no. 1 is a Caono EF-S 18-55mm f3.5-5.6 (came with the camera). Lens no. 2 is Canon EF 75-300 f4.5-5.6 lll USM. Both filters are Hoya HMC UV(O) (these were the most expensive ones in the shop)(also the only ones that would fit my lenses).
If anyone wants to point out that there are better lenses out there, I believe you but these are the ones I could almost afford. Upgrades may take place some day if I live that long.
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