1. COMPATIBILITY: Waterproof filter specially designed for Insta360 Ace/Ace Pro. It effectively suppresses highlight and shadow contrast, reduces oversharpening in focus areas, and delivers a softer image. 2. 1.5MM OPTICAL GLASS WITH MULTICOATING: Features a multilayer nanocoating process and 1.5mm thick glass lens, resistant to scratches and impacts. Withstands water pressure while maintaining optical quality. Builtin rubber ring ensures waterproofing, antifogging, oil resistance, and scratch resistance, while minimizing lens glare and reflections. 3. ALUMINUM ALLOY FRAME: Lightweight design weighing only 8g, ensuring no interference with gimbal calibration. Does not obstruct the lens field of view, enabling shooting without dark corners. 4. CPL POLARIZER: Eliminates reflections, enhances color saturation, and improves image clarity and vibrancy. Restores truetolife colors, making skies bluer and water clearer. Ideal for shooting landscapes through glass or capturing underwater scenes with transparency.