DJI Original Phantom 4 ND4, ND8, ND16 Filter Set-Compatible with Phantom 4/Phantom 3 Adv./Pro with Luckybird USB Reader Applicable with DJI Phantom 4/Phantom 3 Pro./Adv., the ND4/ND8/ND16 filters reduce the amount of light coming into the sensor. It gives you the freedom to create your own work by allowing more control of the camera's aperture, exposure time and sensor sensitivity settings. Put more simply, the ND4/ND8/ND16 filters help avoid overexposed photos. The ND4 filter allows 1/4 of incoming light through, equal to a 2-stop filter. The ND8 filter allows 1/8 of incoming light through, equal to a 3-stop filter. The ND16 filter allows 1/16 of incoming light through, equal to a 4-stop filter.