Apologies if this was already posted: The Olympus Lens Cap Auto Open LC-37C threads on and works as desired on the Panasonic GM1 kit 12-32 mm. The cap is not electrically controlled - there's just a simple mechanism that opens the cap when the lens is extended. I could not discern any vignetting, even though the cap is designed for a 14-42 mm lens. For my wife, it actually makes the camera quite a bit more fun to carry and use. The old drill: 1. extend lens 2. remove thin lens cap (a bit fussy) and stash it 3. turn on camera 4. fire, hoping your subject is still there. 5. undo 3-2-1 Unexpectedly, omitting step 2 made all the difference. Hope this helps someone.