Playing with the Vivitar Series 1 135mm f/2.3 (Canon FD mount) on the E-PL5. I believe this was taken at f/5.6.
This was my favorite lens on the old Canon SLRs, but it hasn't been a great experience on the E-PL5 so far.
1) My copy has developed something that looks like fine oil droplets on the lens elements, which is hurting contrast and probably sharpness.
2) It's too heavy for the small camera body, especially when I'm trying to hold it steady with a magnified view for focusing.
3) Pretty bad purple fringing at large apertures, which is where this lens always shined with film.