I have just received the E-M5 from Amazon with the 14-42 kit lens. I have been using a Pan 20/1.7 with it. Reading the thread above, I tested my cam for rattle snaking. Yes, using the 20/1.7 with video sounds like either a "rattle snake" or electrical interference. I held the cam very steady and it was very noticeable in playback. I then switched to the Oly 14-42 kit lens and tested that. It too is "rattle snaking" or crackling, or getting some kind of electrical sound in play back. I do not hear the crackling during recording. Only during playback. For me, it's not isolated to one manufacturer. Both lens crackle.