LensCoatA(R) for the Canon 400 DO LensCoatA(R) 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. The LensCoatTM 400DO features a clear plastic windows over the auto focus and Image Stabilization controls, and also the distance scale. Also check out the LensCoat Hoodie for the 400 DO