CPL - Circular Polariser Lens, Adjustable CPL Lens Filter with Cleanning Brush for DJI Phantom 3 Advaced, Phantom 3 Professional [ Why you need the CPL Lens for Your DJI?] The purpose of a polarizing filter is to filter out polarized (reflected) light. As a result they can eliminate or reduce glare in glass or water, make vegetation and foliage appear more vibrant, and deepen the color blue in the sky. CPL - Circular Polariser Lens, to help the 4K/HD camera to improve photography and videography when flight. [Easy Installation] Simply screws on and off, vibrant colors and no glare - No tools, clamps or glue. [ NOT fit Phantom 3 STANDARD ] [ADJUSTABLE] Adjusting a CPL is simple: rotate the front filter. You can see the effect by looking at the live feed. [FREE GIFT] LENSPEN - Usually $5, Good Quality, it helps you to clean the lens and your camera more easily!