The lens sold with the GH1 only open to F4, which considering the 17mm sensor is not enough for narrow DOF on short focal (correct me if I’m wrong), plus, having wider aperture make the low light shots cleaner. Does anyone know what lens is compatible with the GH1, while retaining the autofocus feature? I would really appreciate your useful information regarding this. I hope to hear at the earliest from you guys out there. Thanks.