Installation is simple.
DroneKinetics Light Filters and Polarizer are designed to be lightweight and stackable to achieve the desired light control you require.
Phantom4, 3 Pro and Advance users can unscrew the UV-filter from the camera (turn the UV-filter counter-clockwise)
Put the light filter(s) inside the UV-filter
Layer additional ND filter(s) or add the polarizer if further light control is needed.
Turn the UV filter clockwise and screw it back on, but don't over tighten.
Polarizer installation: Starting with the notch pointing upright.
Turning the notch away from the upright position either side at a 45 degree angle will increase or decrease the polarizing effect. You can experiment the rotation of the polarizing filter to get your desired results.