I just purchased a AF-S nikkor 17-55mm 2.8 G ED DX lens a couple of weeks ago and it has been working just grand. Today, I went out to take some photos and now there is a spot. I came home and cleaned both ends of the lens with a tissue and air, and as you can see...still a spot. When I look through the lens I can see a teeny tiny little spot, but both ends are spotless...now what? It is under warranty, should I send it in?