When taking photos with backlighting, side lighting, or flashes, it can not imaging light from entering and avoid fog Enhancing your photography with the HB57 Lens Guard, specifically for 55-300mm F4.5 5.6G lens, providing optimaled protections During forward and side light photography, scattered light from the surrounding area can be avoided from entering the lens From durability ABS this Lens Guard effectively blocking unwanted light, the light shielding guard internal extinction treatments It can accidental damage to the lens and also fingers from accidentally touching the surfaces of the lens