A lot has been said already about unsharp images with the Panny 45-175mm and shutter speeds in a certain range, roughly between 1/100 and 1/250s. Lately I had some unsharp pictures again with this lens and the GH2 mounted on a tripod (Gitzo 1580QR). Unsettled by this I set out to do test shots on this tripod with OIS switched off. Representative sample below: the shot at 1/250s is notably unsharper than the one at 1/1000s. For the record, I don't have these issues with a Minolta MD Zoom 75-150mm which I use a lot, or any other legacy lens in this focal length range. Edit: no differences in sharpness with this lens on the G1 as well. I'm speculating that the moving elements or group picks up vibration from the camera's shutter vibration, causing the element to move a bit despite OIS being switched off. This would explain the different results for it on other cameras. Even the shot at 1/500s was slightly less sharp than the 1/1000s shot. This lens obviously doesn't get along very well with the GH2.