The ND Filter Set for Ace Pro 2 from Insta360 comprises one polarizer filter and three ND filters for shooting in virtually any daylight condition, plus a storage box. The set includes ND8, ND16, and ND32 filters to reduce light striking your sensor from 3 to 5 f/stops. Use the ND filters to reduce your overall light level or to create a shallow depth of field or blurred effects. The polarizer filter reduces reflections while making colors pop in your scene.