Howtosignalprocessing
How is fisheye lens calculated?
fov = 4 * arcsin (image size/(focal length * 4))
The same formula can be used with the 8mm fisheye lenses.
What causes fisheye distortion?
You've perhaps already seen what can happen with this problem after using wide-angle lenses on your drone. The reason fisheye distortion happens in drone photography is because the lens' field of view is wider than the size of your image sensor.
