The Realtree Max5 LensCoat for the Canon 200-400 IS f/4 offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. Additionally, it helps break up the shape of your lens, making it less noticeable to wildlife. The LensCoat 200-400 features a clear plastic window over the auto focus and image stabilization controls, as well as the distance scale. A small hole on the last segment lines up with the red dot indicator on your lens for quick mounting without removing the protective cover.