I loved it at first, but I was only using it on lenses 28mm or wider. Using it on my 70-200 I can notice a pretty significant change in both sharpness and colour. Possibly my eyes are just pixel peeping more now, but I've noticed it worse on my GH2. Is that possible that the smaller sensor would change it? I would've thought if anything it would
be sharper since it is more the center on the lens