It depends on the modern camera, the old lenses are very good on modern cameras up to around 18/24 M Pixels.
If you use old lenses on cameras with sensors that are too dense, then you see the limitations produced by such a different technology.
Then, I'm not sure how to write it in English, but vintage lenses have a central centering, which doesn't get along too well with the focus of digital cameras
It depends on the modern camera, the old lenses are very good on modern cameras up to around 18/24 M Pixels.
If you use old lenses on cameras with sensors that are too dense, then you see the limitations produced by such a different technology.
Then, I'm not sure how to write it in English, but vintage lenses have a central centering, which doesn't get along too well with the focus of digital cameras
I have never seen this even with pretty old lenses. Maybe lack of sharpness but real loss of quality I have never seen