The 49mm Screw-on Tulip Lens Hood from Sensei mounts onto your camera lens to prevent glare and lens flare by blocking out stray light. The lens hood also adds shock absorption to help protect your lens from impact damage. It easily screws onto any lens with a 49mm diameter and includes a locking collar for consistent positioning. As this lens hood can be used with lenses of varying focal lengths, its tulip shape is designed to prevent vignetting while still blocking unwanted light from entering your lens. The hood is ideal for full-frame lenses with focal lengths longer than 20mm, and APS-C lenses with focal lengths longer than 15mm.