The Olympus LH-76 Lens Hood for 40-150mm f/2.8 PRO Lens V324760BW000 is specially designed to be attached to the M.ZUIKO DIGITAL ED 40-150mm f/2.8 PRO Lens. It helps in avoiding the stray light that comes from the external environment. This greatly helps in reducing the glare. The lens hood comes with a special locking mechanism that helps to slide down and out of the way when not in use. This special design avoids the removal of hood when you need the use of camera. This is replacement or spare lens hood for the one provided along with your camera.