Hi, just received this gem of a little lens. Great! One thing puzzles me though. The A setting on the aperture ring. I didn't plan on using it, but since it's there I tried it. It only fixes the aperture to 1,7. Even when pointed to the sky, even when exceeding the minimum shutter speed! What am I missing here? Tried it on both GM1 and GX7, with auto ISO and fixed iso. At aperture priority or manual, no difference.