Have bought me the filter for a new Canon lens (24-70 mm). So far I had always omitted such protection filter, because they cost light (are) in this objective I have decided for reasons of cost differently. The filter was as always well packaged and on time. Fit and workmanship are up to the usual high quality standards of Hoya (already have a long pole filter). So pre-screwed immediately and tried (in a EOS 5DMK III) and ... noticed any differences in light output. The exposure time has not changed significantly, the image quality, in this case, the image quality has not suffered. I am not a professional and did not make any laboratory measurement, but for a serious amateur, the result is totally convincing, so despite the relatively high price of 5 star.
