a tele for E-M5
With the OM 135/3.5 on the E-M5 I can take good photos only when can take the time (a lot of time - but that's clumsy me) to focus. So now am looking for a AF zoom tele. Ideally, a fast zoom 90-180 mm would suit me. Of course such a beast is not available. Any suggestion for similar available alternatives of medium-high quality?