There's a bunch of letters! I have a Pen EPL1, and like to use the IS1 setting. No problem, as it seemed happy to work with the kit zoom. Then I bought the 15mm lens, and set the IS focal length setting accordingly. I don't imagine it's much of an issue with a wide angle, but I did anyway. When I fitted the 40-150 zoom, I checked the settings, and noticed it still said 16mm (I don't expect they anticipated making a 15mm lens when they set it up). I'd been using the 14-42 in between, so it surprised me. And there's no 'Auto' setting for focal length. I checked my EXIF data, and it seems to know which lens is fitted. Should I just ignore the setting and carry on? I just want the confidence that the camera's stabilising properly, and the shakes are all me.