LensCoat for the Canon 400mm f4 DO IS II LensCoat Canon 400mm f4 DO IS II telephoto lens cover offers your valuable equipment some protection from scrapes and bumps, preserving its resale value. It also helps break up the shape of your lens, making it less noticeable to wildlife. The LensCoat Canon 400mm f4 DO IS II features a clear plastic windows over the auto focus I and image stabilization controls and also the distance scale.