LensCoat® telephoto lens covers offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. It also help break up the shape of your lens, making it less noticeable to wildlife. LensCoat® for the Canon 100-500 features a clear plastic window over the auto focus/IS controls. *This cover comes with an optional zoom sleeve that can be used to cover the lens section that is exposed when the lens is zoomed. The kit also comes with an additional piece for when the lens is used with the rotating tripod collar- as seen in the picture.