For those with an E-M5, E-P5 or E-M1, I'm sure you're familiar with the slight hissing/whirring noise that emanates from the IBIS. Well, I'm not really into video but I did do a little over this last weekend and was surprised to find that the hissing wasn't apparent on the footage. On going back to the camera and checking, it's clear that the hissing sound is much reduced when in video mode. Its effectiveness doesn't seem diminished, so I'm wondering why it's so much noisier in stills mode. Has anyone else observed this?, or even better, knows why there's a difference?