JW Lens Hood Shade for Olympus M.Zuiko Digital 17mm f/1.8 Camera Lens as LH-48B + JW emall Micro Fiber Cleaning Cloth Black Metal Design Complements Lens Hood Thumb-screw design (when thumb-screw is tightened, it interacts with the internal compression ring which tightens the hood onto the lens.) Blocks Stray Light from Entering Lens Protects Lens from scratching