Title sums it up really. I got a new GM1 from Photo Warehouse (authorised Panasonic retailer) in New Zealand about 2 months ago, been using mostly fast lenses at wider apertures ever since (mostly low light social stuff, E-M5 is still primary camera). This weekend I stopped it down significantly for a landscape (E-M5 ran flat) and noticed a black blotch in the blue sky... had a look and sure enough, a speck of something. Sensor clean and blower couldn't dislodge it. A closer look revealed that it is under the SSW filter! I've yet to hear back from the store... what are my possible courses of action here?