Fkybarless,
from the DJI website, i can see that you have a Olympus M. ED 12mm f/2.0. If this is correct then actual focal length is 12 mm and not 25 mm (which is the equivalent focal length corresponding to 36 mm format sensor). Your sensor is a 4/3-inch CMOS with 4608 by 3456 pixels. This sensor size is 17.3 mm by 13 mm. Thus pixel size is about 0.00375 mm (17.3/4608).
So I would try entering following values for pixel size and focal length in Camera Calibration Initial tab:
- Pixel size (mm): 0.00375
- Focal length (mm): 12
And see if process gives better results after alignment. Adjusted values of Fx, Fy, Cx and Cy parameters should not vary too much from initial values...If they do vary too much, you can always try to use fix calibration button in Initial tab...