JW LH-J66 Lens Hood Shade With CPL ND Filter Shadow For Olympus M. Zuiko Digital ED 12-40mm f/2.8 PRO Lens + JW emall Micro Fiber Cleaning Cloth Comes with a filter access window for CPL, ND filters adjustment Blocks stray light from entering the lens Extra protection from accidental impact Reversible for easy storage No vignetting will be caused with the hood on