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