DJI Phantom 3 Filter ring, holds ND filter gels on existing camera.

This Neutral Density filter ring is designed for the DJI Phantom 3. Included is a 3D printed ring to hold the ND filters in front of the existing lens on the Phantom. This ring is designed for a 31mm diameter ND filter gel. Simply choose the ND filter/s that you need for the exposure you want and stack them against the Phantom camera and install the ring to keep them in place.

Here is a YouTube video on how to use them
https://youtu.be/0TbDhJvIUvA

I am selling a pre-cut filter set