with_and_without_filter

I have tested Nikkor 18-200 VR lens WITH and WITHOUT filter. I used Hoya HMC UV(0) and HAMA SKY 1A fiters. 3 shoot per each combination. Nikon D50, focal lenght 200mm, f/6.3, VR ON (normal). Pure crops, no postprocessing. What do you think about it?