Avoid stray light and prevent surrounding interfering light from entering the lens when shooting with lights or at night. Protect the lens while enhancing image quality. Sandproof, windproof, waterproof and shockproof, reducing the influence of stray light during shooting. Protect the lens from damage and prevent accidental touch by fingers. To some extent, it can shield the lens from wind, sand, rain and snow. Reduce lens flares. The matte finish on the inner wall further reduces or eliminates lens flares.