Hello! I just joined the forum, and I have almost no knowledge of photography, but next highschool year i will be taking a class. Right now I have alot of interest in action sports photography.... my current problem is my Canon Aspherical 28-80mm lens. when i look through the view finder, the lens shows everything in an almost tinted color. I have two other lenses i use but this was my primary lens. also, when i try to focus, it will not allow me to stay focused on one thing, itll switch back and forth, forcing me to use manual focus. my camera is a Canon EOS 10D any idea whats going on?