my experience with this one is weird. i first tried it on my Olympus E-520 years ago and couldn't get decent sharpness. recently i tried it again on my E-M5 and was surprised. i was able to get decent results.
this lens is a preset m42 lens.
_________________ my tools:Oly E-M5 + 45mm/1.8 + Oly E-520 + 12-60 + 14-42 + 70-300 + Sigma 105mm + FL-50R + EC20 + SRF-11 ring flash
I also have a preset Typonar 135mm f/2.8 and I wonder if it's the same lens as yours.
My version is rather rubbish....but maybe I should test it again as well ).
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