When lighting photography or night photography, you can avoid the surrounding interference light entering the lens. It can prevent accidental damage to the lens, can prevent fingers from accidentally touching the lens , 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. 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.