I took delivery of a Panasonic 15mm lens from winktokyo on eBay on Monday. Optically and mechanically the lens seems ok (slight decentering on the left border but not enough to concern me). However the amount of dust in the lens bothers me. It's not visible from the front element but shining a pen light into the rear element shows it (attached). Just wondering if other Panasonic 15mm owners have this much. I've contacted the seller but I'm sure even they are willing to take it back, sending it back to Japan will cost a chunk of change.