ContextCapture - DJI Zenmuse X3 specs

Question

Hey, I have a problem with determining the focal length and the sensor size of the camera from a drone DJI INSPIRE1. I suspect that the focal length is 20mm, but the sensor size is not clear. 
 Here are the specifications that I have found for the camera. 
 
 Best Regards 
 Werner

Gregory Moreno · Answer

It's the largest dimension of the sensor that is required. In this case it is 6.17mm 
For your 35mm equivalent try using 3.7mm I've found it to calculate anywhere from 3.5 to 4.1