Hello, I have a Canon 5D and I noticed the other day that there is some dust or specks when I look though the viewfinder. I have taken several test shots and there are no visibile marks on the image itself. I have tried another lens but I still see the marks. I have cleaned the camera and the lenses as a precaution but this has not worked. I still can see the tiny black spots. Is it possible that dust has gotten into the viewfinder? I figure it is not on the sensor or lenses because it does not show in my photos. I also cleaned and there is no improvement. I would hate to bring it in to be serviced for a sensor cleaning if I don't have to. Any advice?