Sigma LH830-02 311 Lens Hood for 50mm F1.4 DG HSM Art Lens (Black)The Sigma LH830 02 Lens hood is a petal shaped hood for a 50mm F1. 4 DG HSM Art Lens. It blocks light from entering the lens and keeps it safe from unwanted impact. To prevent unwanted flare, this petal shaped hood has a ridged interior surface. You also get additional defense against unintentional impact and the elements because the hood extends out from the front lens element. It comes in a premium black color that looks chic and classy.