I have a Canon 60D and the kit lens as well as a 10-18mm lens. Regardless of the lens, when the sun is in front of me at any time of the day the sky separates into a very distinctive two tone of dark and light blue. I don't get any lens flare but just the weird color which looks like a very sharp gradient that goes diagonally across the sky. I use a lens hood and no filter. I never had this problem with my Rebel XS. Is there something I can do to avoid this?