Long story short, I bought a Sigma 400/5.6 with a "Regent" uv filter attached. The image quality was appalling with the filter fitted (100% Crops, w/filter on LHS):
Just out of curiousity I also tried the filter on my 10-22 and there was no noticible reduction of quality; it also seems fine on my 17-55 as well.
Can anyone explain this?
Just out of curiousity I also tried the filter on my 10-22 and there was no noticible reduction of quality; it also seems fine on my 17-55 as well.
Can anyone explain this?