Variable ND Filter 2-400 allow you to change how much light is stopped by simply turning the front of the filter from ND 2-400 which equals to 1 stop to 8 2/3 stops , You can adjust to reduce the bright light in large aperture situations when a narrow depth is field is needed.
Ring: Made of Aluminum alloy
Filter: Made of high quality Glass
VARIABLE ND FILTER 2-400 Diameter: 37.5MM
Glass Thickness: 0.5MM
DJI INSPIRE 1 ND2-400 VARIABLE ND FILTER X 1PCS