• Product Overview: Compatible with Canon Lens Hood ET-74B (Hood) (Single hood) (Product Selection Notes) The compatible hood has a certain lens that can be attached to two types of lenses. Please be aware that there are warnings on the product images. (Hood) 1. Match the red mark on the end of the lens and the white circle of the hood. 2. Rotate 90 degrees clockwise. 3. Finally, turn it slightly stronger clockwise. (There is less rattling after installation, so please turn it a little harder at the end. Snap to lock ) • Compatible Lens-1: RF Mount Zoom Lens RF 100-400mm F5.6-8 IS USM Lens It has a locking mechanism that can be reversed for storage • How to check compatible lenses: Please check the lens model number on the surface where the lens cap is attached, and make sure that the "RF 100-400mm" is listed in the end of the "USM" • 【Role of hood】 Reduces harmful light when shooting, protecting the lens when moving or taking pictures • [About F-Foto] [Established in 2012] Japanese camera accessories manufacturer. (Headquarters in Gunma Prefecture) [Net Specialty] Since it is a manufacturer that does not have a shop, we can offer high quality products at a reasonable price. (Many of High Rated Products) We have a large number of original products with high ratings (300+ reviews), such as shoe covers, tripoders, lens plates, and compatible hoods. High Quality (Inspected in Japan Factory) We inspect every number of products produced in overseas factories and then deliver products to our warehouse. (Safe to Use) In the event that there is an initial defect, please buy with confidence