Hey, I've noticed that my E-P2 is stopping down the 20mm 1.7 to less than its full aperture whenever it's in live view mode. I'd estimate it's probably f/4 or a bit smaller. When autofocusing, it briefly opens up to full f/1.7 but then stops back down once it's found focus. This doesn't affect picture taking at all, but I'm just curious as to why the camera does this. One positive side-effect is that you can "hear" when the AF has locked on because of the click of the aperture as it opens up and then closes back down. However, surely it isn't good for battery life or the aperture mechanism for it to be constantly opening and shutting the aperture whenever it performs an autofocus. You'd also think that it'd be better for the live view preview to have the least noise possible. Anyone else noticed this and have a smart explanation?