The one I ordered has something messed up inside so I contacted customer service and they promptly sent me out a replacement. There's nothing wrong with the replacement lens they sent me, in fact this thing is tack sharp in it's focus. Well Here's an update. The replacement lens has done the same thing the first lens did. While focusing you see something inside the lens drop via the view finder and hear a thud noise and then all photo's after that are out of focus.