ND4 (neutral density) filter to suit both the Phantom 3 Professional and Phantom 3 Advanced.
It helps you to reduce the amount of light coming into the sensor. It gives you the freedom to create your own work by allowing you to have more control of the camera’s aperture, exposure time and sensor sensitivity settings. Effectively, the ND4 filter helps to avoid overexposed photos.
An ND4 filter reduces two gears of the aperture, average transmittance of 25%.