Key Features For RF 50mm f/1.8 STM Lens Blocks Stray Light from Entering Lens Protects Lens from ImpactDedicated to the Canon RF 50mm f/1.8 STM lens, the ES-65B Lens Hood helps to minimize flare by deflecting stray light from entering the lens. The hood also provides additional protection to the lens from accidental impacts, bumps, or scratching.