Prevent glare by stopping light from coming into the lens at side angles. Improves contrast and image quality. Protects lens from scratches and impacts. You can use lens cap and filter with the hood on a lens. Can be installed in reverse position to save space when not needed. Improve quality and contrast of your photographs with this lens hood. Also allows to protect your lens against shocks. An accessory essential to the photographer. Compatible with 50-250mm lenses.