The Nikon HB-51 Bayonet Lens Hood is an optional bayonet lens hood specially designed for select NIKKOR lenses. This lens hood helps the lens to achieve its best performance by blocking the stray light from affecting the lens. Using this special bayonet lens hood, you can capture crisp and clear images without any flare or ghosting effect affecting the image quality. Offering the best performance for a long time, this lens hood is made of high quality element that is durable as well. Equally, this lens hood also helps in protecting the lens from getting scratched from accidental bumps.