The lenscoat lens cover for thecanon 400mm f4 do is ii lens protects the lens with a 100 closed cell neoprene coat offering your valuable equipment some resilience to bumps jars scrapes and nicks easy to install and remove leaving no residue on the lens lenscoat lens covers are ideal for nature and outdoor photographers where the digital camo pattern helps break up the shape of your lens making it less noticeable to wildlife and allowing you to blend in with your surroundings lens co