LensCoat telephoto lens cover 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 and makes it more comfortable to handle in hot and cold conditions. Features a clear plastic windows over the Auto focus and Image Stabilization controls. This cover comes with an optional piece for the lens is zoomed out to 400mm which can be quickly and easily put on and removed with its Velcro attachment as seen in the picture.