LensCoat for the Canon 600 f/4 with IS II. LensCoat 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 LensCoat 600 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 indictor, making it easy to quickly line up your lens with camera mount even with the cover installed.