Thought I'd start a separate thread for this. I recently got an E-M1 to replace the stolen E-M5 kit (E-M5, 12-35, 45/1.8 and 100-300 stolen), and I've found a good deal on a 50-200 SWD (not much more than most non-SWD versions are going for around here these days) which will take the place of the 100-300. I don't shoot tele all that often, but when I do I'm find with carrying around a little more weight for the quality. I'm looking around to find a (second-hand) teleconverter to match. My gut feeling is that the 1.4 will give me better quality, will be more likely to yield acceptable AF speeds on the E-M1 (and 280mm is plenty), but I was wondering about any experiences people had with image quality and handling on the E-M1 with 43 HG/SHG glass and either of the converters, in terms of both image quality and AF speed/handling.