Hi guys!, I need help! I notice today that when I took a photo on the bright sky, there is a black dote which I don't know what . At first I thought is my lens dirty but when I change to another lens, the dote is still there at the same position. Is it my camera body dirty? I'm using Nikon D70s and sigma 18-200 lens and D70s kit lens. really need your advise. T:cry: hanks