I recently took delivery of a Olympus 9-18 for use with filters when I want to go wider than 14 2.5 which is the widest lens I have currently that accepts filters. I have a 7-14 for UWA needs but got the Oly for its ability to take filters Now I am facing a peculiar problem when I use this lens on my GX-7 in AF-C. There is a jumping of focus and I can see that in both the Live View / EVF, the scene moves forward and back all the while when the shutter button is half pressed for acquiring focus. This issue is not seen on my GX-1. But when I use AF-S on GX-7 this jumping of the view ceases completely in both the EVF and LV. Is this a known problem with this lens? I only intend to use this lens for landscapes on a tripod with no real need of AF-C. So far I am liking this lens except for this weird behavior in AF-C on my GX-7. Any insights on this will be highly appreciated.