LensCoatA(R) for the Canon 800 f/5.6 with IS LensCoatA(R) telephoto lens covers offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. It also helps break up the shape of your lens, making it less noticeable to wildlife. The LensCoatA(R) 800 features a clear plastic windows over the auto focus and Image Stabilization controls, and also the distance scale. A small hole on the last segment lines up with the red dot indicator, making it easy to quickly line up your lens with camera mount even with the cover installed. As of 12/7/11 the LensCoatA(R) for the Canon 800 f/5.6 includes an optional piece for focus ring.