Professional Replacement HB-40 Bayonet Lens Hood for AF-S Nikkor 24-70mm f/2.8G ED HB40 shade Replacement HB-40 Bayonet Lens Hood for AF-S Nikkor 24-70mm f/2.8G ED HB40 shade The lens hood provides a cost-effective solution to the problems caused by sun glare rain and wind-blown debris and is also valuable in providing protection against knocks and damage. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact Lens hoods block side glare and augment the protection provided by filters to the lens surface and ring.