focal length

Is there a definitive source for DJI drone camera specifications such as sensor size (in pixels) or true focal length (not the 35mm equivalent)? I know that DJI specifies the camera's sensor size using notation such as 1/1.3 but I am looking for the actual sensor size in mm for all DJI drones...

Now, I understand that the Mavic is a self contained system, but just wondering if anyone had any success in changing the gimbal / camera / lens? I would much prefer a less wide lens, something around 24-30mm. I guess there might be a way to use a lens adapter, but that would likely make the...