Originally posted by luxornet Thank you very much for your comment.
The picture is modest in the center and the rest blurry, especially on the right.
You could possibly be slightly front focused as well - I know my 70-210 has a weird (though cool) swirly bokeh effect which could be in play here as well. Again, if I were to be forced to pass blame, my first guess would be the adapter. Generally speaking those old vintage lenses were made like tanks - it would take a LOT to cause the lens to go askew short of it being a dud right off the assembly line.