The ET77 Lens Shade is to effectively block unwanted light and reduce unwanted lights,enhancing your photography From durability ABS this Lens Shade effectively blocking scattered light, the light shielding covering internal extinction treatments During forward and side light photography, scattered light from the surrounding area can be avoided from entering the lens It can accidental damage to the lens and also fingers from accidentally touching the surfaces of the lens When taking photos with backlighting, side lighting,it can not imaging light from entering and avoid fog