neuroanatomist said:
I guess you didn't try my suggested test. I shoot indoors a lot, there are usually strong light sources (ceiling light fixtures, floor lamps, etc.) in the frame. In that situation, a cheap filter is a bad idea (I did try a cheap Tiffen once, since it came on a used lens I bought - if you'll pardon the New Englandism, wicked bad flare; no issues with my B+W MRC filters).
No offence but this wasn't about a controlled test using blah, blah and doing blah, blah. I picked up my camera with the filter on, took a shot. Took the filter off and took the same shot. Did the same thing with the other two. Just random shots that anyone of us could take. I DID take these indoors, with normal indoor lighting conditions, using my onboard flash. Nothing special...
Again, if you don't like filters, then don't use them. My test was to show that even though under very close examination you can spot a difference, but just viewing a photo normally, its a lot harder.
Life is too short. Go out and take some photos!