I've just bought (used on ebay, but very new and apparently in mint condition) a Panny 45-75mm. I'm using it on an Olympus E-PL2 body, and so far it's not proving very happy. The main issue is that the action of the zoom (whether in power or manual use) is very noisy and rattly at several points. This is only the case when the lens is attached to the body and powered up - otherwise it's quiet and smooth. It's the same whether or not I have the IBIS turned on on the Olympus or not. I've updated the camera firmware (though I didn't have an option to update the lens firmware). Does this sound a familiar problem to anyone? I'm also not convinced I'm getting the sharpest of images from it. thanks, Martin.