Firecrest 39mm Superslim stackable multicoated UV MC Filter 39mm Firecrest UV MC multicoated filter in stackable 5.5mm ring Superb UV protection at an affordable cost Built in the UK using Schott Superwite glass for highest image fidelity Firecrest multicoating is anti reflective, anti scratch and hydrophobic for shooting in most challenging conditions Provides essential lens protection whilst improving image quality by reducing UV pollution