I could be confused. But obviously the cam system on the R lens does not allow for wide open metering on Oly so stopping down cannot be compensated for when setting the lens aperture. I guess it could get pretty "dark" in the EVF but I"ll take your word that it is doable. At one point I had a one cam 50 summicron R on my SL and I had to stop down meter. I did not like it and swapped for a newer three cam. I could have moved the one cam to the second cam position.....but still left with a lens requiring Series filters and hood. NO BUENO imo.