From the Manufacturer LensCoat for the Canon 500 f/4.5 Realtree Max4 HD. LensCoat 500 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. The LensCoat 500 f4.5 features a clear plastic windows over the auto focus 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.