Canon Lense FD 85mm 1:1.8 S.S.C
canon t2i/550d with Fd to EOS adapter
You can see that sharpness is quite bad with FD to eos adapter.
The look is very soft when lens is wide open.
If you want to remove that, just +1 or +2 f-stops, the image will be sharp (but you'll loose lighness).
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