Canon ET-74B Lens Hood For EF 70-300mm f/4-5.6 IS II & RF 100-400mm f/5-6.8 IS USM Zoom Lenses - Used Genuine Canon Lens hood. Designed to fit the Canon EF 70-300mm f/4-5.6 IS II and the RF 100-400mm f/5.6-8 IS USM lens, the ET-74B lens hood prevents flare and ghosting caused by stray light entering the lens. For use when shooting into bright light, this robust lens hood also helps to protect the lens’ front element from accidental damage.
eBay