The horizon is below the centre point of the fish eye lens and therefore is distorted in the opposite direction to the curve. This is why it looks flat. Balloon footage with fish eye lenses can only prove anything if the horizon crosses the centre point.
You can see that it's a fish eye lens if you watch the rest of the footage...
The horizon is below the centre point of the fish eye lens and therefore is distorted in the opposite direction to the curve. This is why it looks flat.
You can plainly see that the footage is taken with a fisheye lens in the video I posted...