Hi All, Got some extension tubes to try out some macro shots. The tubes work great with all legacy lenses i got, it zooms and focus accordingly. However when I mount any Lumix G lenses (20, 14-45, 45-200), i found that the focusing ring does not focus at all. I've also check that with electrical connection (no tubes attached), and switch to MF, the focus ring works fine. Is this a case where focus is disable when there are no electrical connection? Any help appreciated, thank you.