I bought this lens reconditioned off the Olympus website. I've tried the lens on both my E-M10 and GH4 while in MF mode and the focus ring doesn't seem to do anything. I would guess that the red line on the focus distance marker is supposed to move (as it would when hunting for focus when used with AF). I don't think it matters what position the limiter switch is on. I thought I would ask you guys if I'm missing anything before I go ahead and send it back.