A&R Professional 77mm Reversible Lens Hood For Canon & Nikon 10-24mm 12-24mm 17-55mm 24mm 16-35mm 17-35mm 24-70mm 24-120mm A&R 77mm Reversible Lens Hoog. A lens hood is a must for every D-SLR photo enthusiast. They are primarily designed to avoid unwanted stray light from entering the lens by extending and shading the end of the lens. The screw thread of the lens hood is easily attached to the filter thread of the lens. The shade is made of rigid plastic which will also protect your lens from damage caused by shocks. 77mm Lens Hood To fit any lens With 77mm Threads. Easy to store with Reversible feature Reversible Feature That will save space and and insures safe keeping. Reverse the lens Hood by a simple half twist and remove. Same Day Shipping Reliable Service