When taking photos with backlighting, side lighting, or flashing, it can not imaging light from entering and avoid fog The 72mm Lens shield is to effectively blocking unwanted light and lens unwanted light, ensuring optimaled photos for your photography needs During forward and side light photography, scattered light from the surrounding area can be avoided from entering the lens From durability ABS this lens shield effectively blocking scattered light, the light shielding cover internal extinction treatments It can accidental damage to the lens and also fingers from accidentally touching the surfaces of the lens