Originally Posted by Dave in Wales
Essentially, all you have to do is set the camera to manual focus, and cycle the camera power off and back on. The lens automatically resets to the hyperfocal distance for the current f-stop. I believe this works on all of the Lumix Micro 4/3 cameras, but have only confirmed it on the GF1. I would welcome feedback from others who have tried this technique on other models.
Not quite! your close though.
If you use manual focus and set the HFD to what you want, lets say 5mtrs, when you power off the camera then (perhaps later on at the next location) power the camera back on (still in MF mode though) the focus position will remain the same. in other words, when in MF mode the lens does not reset to infinity position as it would do under AF mode.
Useful if you want to retain a particular DOF by setting HFD for a range of shots (Aperture must remain the same though, so you will be using Shutter speed to control exposure).
I think this feature on the panasonics (first noted on GF1 I think) has been mentioned in forum posts