What is the in the size of the area seen by fisheyes camera with different resolutions of 5/8/12MP?

This video shows a fisheye camera in real view at different resolutions.

At 5Mp/12MP, the 1.44mm fisheye lens is fully round.
The 4K 8MP, 1.77mm or 1.44mm lens, the picture is only semicircle.

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Видео What is the in the size of the area seen by fisheyes camera with different resolutions of 5/8/12MP? канала BesView Security