How to calculate precise vertical and horizontal field of view of camera in photo and video mode, if SDK 4 returns only 35mm equivalent focal length, but no matrix size or its original aspect ratio or its maximal resolution?
To be able to calculate FoV we need one of this options:
1) Real matrix size in mm to calculate crop factor and then real focal length and then angles from real size and real focal length
2) Original aspect ratio to calculate equivalent 35 mm matrix size with the same diagonal and then use its dimension and 35 mm focal length.
3) Original maximal resolution to calculate original aspect ratio and do as in p.2
But DJI SDK has nothing except 35 mm focal length and currently selected aspect ratio which may not equal original.
Could somebody explain how to calculate precise vertical and horizontal fov?
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