I might add that EPhotozine has tested the lens on the 5DSR - and arrived at the same conclusion: beautiful center, soft corners up to and at f/2.8.
https://www.ephotozine.com/article/canon...view-28614
So that's pretty much in line with your results Klaus, and contrary to what SLRGear has seen on 21MP 1DS Mark III. Serves as a confirmation that this is a true result, not any error in methodology. In truth, it looks like the 5DSR should be avoided lest the user be hit with a double whammy of the greater corner softness at large apertures and the earlier onset of diffraction limiting.
I wonder how well the best known zoom lenses would fare on the 5DSR? (16-35/4 IS, 24-70/2.8 II, 70-200/2.8 IS II...)
https://www.ephotozine.com/article/canon...view-28614
So that's pretty much in line with your results Klaus, and contrary to what SLRGear has seen on 21MP 1DS Mark III. Serves as a confirmation that this is a true result, not any error in methodology. In truth, it looks like the 5DSR should be avoided lest the user be hit with a double whammy of the greater corner softness at large apertures and the earlier onset of diffraction limiting.
I wonder how well the best known zoom lenses would fare on the 5DSR? (16-35/4 IS, 24-70/2.8 II, 70-200/2.8 IS II...)