Originally posted by Gooshin his comment is fine
and t-stops have to do with your claim that UV filters offer no image impact, when even the best of lenses consume light, so much so that they bothered to create the concept of t-stops in the first place.
his comment was asinine. right up your alley. t stops have to do with light loss. I said very clearly that some light loss will occur. there is a big difference between losing light and degrading the image, as you suggested. thus, t stops are irrelevant. not that it would matter anyway as the amount of loss is so minuscule that exposure is virtually unaffected. I have an Asahi Pentax 'Ghostless' UV filter on my auto-takumar 55mm and there has been absolutely no noticeable degradation of the image by its use on film or digital (even pixel peeping) and we are taliing about a non multi-coated (curved) filter from the late 60's.