Compatible with ef85mm f1 8 usm ef100mm f2 usm ef100 300mm f4 5 5 6 usm ef75 300mm f4 0 5 6 ef135mm f2 8 using a lens hood helps prevent light from hitting the front lens element from the sides reducing flare pictures taken with a lens hood fitted can have richer colours and deeper saturation a lens hood also provides some protection to the front of the lens