The tamron da18 lens hood is for use with the a18 and b008 18 250mm f35 63 di ii ld lens and 18 270mm f35 63 di ii pzd lenses the hoods does not fit the older version of the 18 270mm lens af18 270mm f35 63 di ii vc ld aspherical if macro lens lens hood help reduce lens flare and can protect the front of your lens from knocks