Originally posted by Frogfish Like to explain the anomaly then ? If you can't then it must have been user error because you can't get a sharper shot with a filter on than without !
no anomaly. You're confusing contrast and sharpness. Typical mistake. Remember this is a 100% crop. Both images have exactly the same sharpness, but the one with the UV filter gained a tiny bit of contrast for some reason. Maybe the overcast sky was slightly thinner at that very moment. It's perfectly normal for there to be such a small brightness difference in outdoor conditions. Especially in Manual mode when I make no adjustments. It did take me 3 seconds to remove the filter, and then another 3 seconds for the self-timer to elapse.
edit: I also forgot to set a manual white balance. These were shot with AWB, which might explain whatever "bluish cast" you people are seeing (which, btw, I don't see at all... maybe the right side of your monitors are messed up). The images above were developed "as shot" and not with a specific WB profile.
What I want to know is: where are these glaring differences that other people were warning me about in this thread? I thought I was supposed to expect a significant degradation in quality here, not some barely-noticeable nit-picks that could be caused by anything.
Sounds like made-up stuff to me. Some unfounded claim to suit the theory that adding a glass element in front of a lens MUST affect it negatively.