Has anyone had issues with a 50-200 SWD almost entirely refusing to focus on an EM-1? I recently got what looked to be a great condition 50-200 SWD but when I attach it to the EM-1 with an mmf3, it will not focus but within a short range. If I manually assist the focus can then lock in and all is good, but if the lens has to re-adjust any reasonable distance it just "twitches". I'even noticed that if I push the shutter button all the way down and then let go, the lens will keep twitching and trying to focus for several seconds and then make the exposure. All my other m43 lenses work fine and I've used the 35 macro and 14-54 4/3 lenses adapted before on this camera and they work fine. Any ideas on this. I've reset the camera and tried numerous settings and no go. Before I send it back I'd thought I'd check here and see if anyone had an idea.