Some of us have OIS issues with the Panny X 45-175mm when using shutter speeds in the range (roughly) of 1/60...1/250s, especially on the GH2 (like me) and GX1, so it seems. This probably comes from a fast shock-like movement of the OIS part of the lens due to shutter vibration, for which the OIS cannot compensate (too many high-frequency components). Now I'm wondering: a 45-175mm lens sample with this issue may work perfectly on a G5 when using the electronic shutter because of the lack of shutter vibration. Does anyone have such a sample and tried it out on the G5? Thanks!