By stopping unwanted light from shining directly into the lens, the ET-74B Lens Hood helps to preserve image quality by reducing flare and ghosting. It also serves as protection for the lens front element. Benefits A high-quality lens hood designed specifically for the EF 70-300mm f/4-5.6 IS II USM lens Can also be fitted to the lens backwards to save space in your bag Protects the front of the lens from accidental damage Preserves image quality when shooting into the sun What\'s in the box ET-74B Lens Hood Compatibility EF 70-300mm f/4-5.6 IS II USM RF 100-400mm F5.6-8 IS USM