So, I haven't really used my GX7 in a while.... Have shot much more with my GH3. Anyway, I now have the GX7 with me on a trip, and have run into an annoyance I can't seem to solve. I'm using single point af, and every time something (like my nose) touches the touch screen, the AF point moves to that spot. On the GX 7, can I lock the AF point to the middle of the screen? Failing that, can I turn off the touch so it doesn't register at all? Many thanks.