HI I was testing my new lens out shooting some video and had the focus in video mode on continuous AF and when playing the video back I can hear a constant rattle, it obviously goes when I turn this option off. The sound is heard when it has to refocus, so if anyone with the same combination could try this out for me, or someone offer an explanation, it would set my mind at ease. Thanks John Edit: Forgot to add..I took it back to the shop a day later and the other copy they had did exactly the same (they reckoned it was because it being an olmpus lens on a Panny body). Also it made the noise on a G6. My 14mm though is as quiet as a mouse.