This ET-88B Lens Hood from Canon helps to block sunlight or other light sources for the RF 600mm f/11 IS STM lens to prevent glare and lens flare.The hood also provides additional protection to the lens from accidental impacts, bumps, or scratching.
★★★★★ Perfect fit and does exactly what it should. It blocks glare effectively and adds great protection to my RF 600mm f/11 without adding bulk. Easy to attach and feels sturdy—highly recommend.