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I am glad to see R series lens to perform superbly on DMR. At the same time I wonder how much difference to the better (?) would happen if one would use the Sony alpha 7r body with a adapter ring? I am not familiar with the Sony camera but assume that the adapter ring does not change the lenses to AF but one is confronted with a similar situation as trying to fit a Leica R lens to Nikon body with a Leitax adaptor? This makes the focusing difficult when trying to adjust the aperture right for the exposure...Show more →
The adapter ring (Metabones, Novoflex, etc.) for the Leica R to E-mount (sony) doesn't change the lenses to AF (as you already know), but doesn't have the potential problem of focus shift as you are describing with the Leica R to Nikon body via Leitax adapter. This is because of the wonderful EVF. What you see in focus in the EVF is what you are going to get (granted that you don't move too much and your subject stays pretty still, etc.) regardless of what aperture you're using. It's all "real time" , which means when you stop down you'll be seeing a darker image in the EVF. It's not like a Canon or Nikon AF lens where the aperture stays at its largest aperture even when you tell the camera you're stopped down. On the DSLR, the aperture only changes when you press the shutter. For the adapted lenses on these Sony and other cameras, you control the aperture and what you see is what you get (WYSIWYG).
If you're having trouble seeing what's in focus because you've stopped the lens down a fair bit, then using a tripod will certainly help (if you can or are allowed to use one at the time). Open your aperture to focus, then close the aperture down to what you want, modify the exposure as you see fit and you'll have perfect focus. That's because of the lack of focus shift. I have such a fun time using my MF lenses on my A7, where I had to rely on custom split screen focusing screens for my DSLRs which didn't always guarantee the DoF you were looking for because focus shift came in and messed up the photo.
Sorry if I'm repeating something you already know.