How to select correct ND Filter for your DJI Drone Want to to know how to select the correct ND filter to get cinematic DJI Drone videos? Always asked which filter to use? What does ND4 mean? What does 3 … source Post navigation Augmented reality based drone control using HoloLens: Drone-Augmented Human Vision4K Istanbul / Turkey by Drone Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website