Compatibility: ND Filter Kit for DJI Avata and O3 Air Unit camera lenses. Multi-layer coating optical glass: nano coating process provides high optical quality; water-repellent, oil-resistant and scratch-resistant; reduces lens reflections. Aluminum alloy frame: lightweight design that does not affect gimbal calibration; laser-engraved markings will not fade; black matte surface prevents light leakage and ghosting. Filter functions: ND filters slow shutter speed for time exposure or motion blur; CPL filter reduces glare and reflections from water, glass and similar surfaces; UV filter blocks ultraviolet light and reduces bluish cast in your images. Use scenarios: - Sunny outdoor landscapes with water or glass surfaces to control exposure and minimize reflections. - Aerial time-lapse or smooth video that benefits from controlled exposure. - Shots near water, snow, or glass facades where glare reduction and color balance are important.