I received my new Tamron 17-35mm lens a couple of days ago, and just noticed today there is a white "speck" inside the glass when looking at the back of the lens. Is this common? I took a couple of test shots with it today, & was pretty happy with the results. I was not able to notice the speck on the pix. The dust is located almost exactly dead center. I'm a little worried this may cause a problem down the road.
Willie

