This EW-73B Lens Hood prevents flare and ghosting, caused by stray light entering the lens. It is particularly useful when shooting into the light as it protects the lens front element from accidental damage. Benefits Safeguards against stray light Helps protect lens front element Can be reverse fitted for space saving in camera bag High quality design and construction What\'s in the box EW-73B Lens Hood Compatibility EF-S 17-85mm f/4-5.6 IS USM EF-S 18-135mm f/3.5-5.6 IS STM EF-S 18135mm f/3.55.6 IS