The sharpest lens I ever used - barring none
It is unbelieveable but, my sharpest lens (I have used all sorts of Canon, Nikon, Schneider and other lenses) was a 90mm f/2.5 Series One Vivitar Macro. Don't confused this with the 90mm f/2.8 Vivitar Nacro which was O.K. but, not great.
I wish I still had it - it would be worth getting a Canon EOS adapter for and using it as a manual focus macro lens. It was a heavy lens, built like a tank and capable of 1:2 inmagery alone and 1:1 with an adapter lens.
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