It can prevent accidental damage to the lens, can prevent fingers from accidentally touching the lens surface, and can also protect lens from damaging by wind, rain and snow. In along-light, side-light photography, avoid surrounding scattered light entering the lens. When lighting photography or night photography, you can avoid the surrounding interference light entering the lens. Made from quality material, light-proof, improving your contrast and image quality of photos. In the case of backlighting, side lighting or flash photography, it prevents the entry of non-image light and avoids smog.