I've just bought two of their '+' UV filters for a Canon RF 85 f1.2 and the other for a Canon RF 28-70 f2. I have noticed zero difference to before the filters were fitted. I like the fact the lens glass has protection and over many years using Hoya Pro 1 filters have noticed no difference...
wow, I’ve been a Canon user since the mid eighties and never knew this lens existed ! I can’t answer your question but have found a lens I never knew existed !
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