Hi all, I just picked up a Panasonic 25mm 1.4 that chatters on both my GF1 and G5 Panasonic bodies. In bright light whenever the camera focuses, I hear the aperture blades snap (sometimes accompanied by a very quick white flash on the LCD screen). I'm in Minnesota, so by bright, I mean very bright, snowscape. Also, when the lens is not attached to the camera, if I shake it (not violently), something inside moves. I'm wondering if this is normal, as nothing moves in my 20mm 1.7. Thanks for the help. P.S. The lens seems to meter and focus fine.