I just purchased a used 50-200mm MKI with the MMF3 adapter. The image quality seems very nice. The AF behaves in a certain pattern: 1) Quickly focus pass the AF spot (Can hear motor) 2) Quickly focus pass the AF spot again in the other direction (Can hear motor) 3) Goes into snail mode and slowly focuses until locked The whole process takes about 2 secs. Is this normal behavior? Is there any settings that I can change to speed up the AF? I am using it on the EM-5. After the focus locks, I would say 30% of the time the focus is off. When it does nail it, it's very sharp. Is this normal behavior? I think I can live with the AF speed, but the accuracy is a pain, as you have to refocus, sometimes a couple of times. Any thoughts and suggests on how I can improve the usability of the lens? Thanks.