What does fisheye lens mean?

The fisheye lens is a lens with a focal length of 16mm or less and a viewing angle close to or equal to180. It is an extreme wide-angle lens, and "fisheye lens" is its common name. In order to make the lens reach the maximum shooting angle, the front lens of this kind of photographic lens has a short diameter and protrudes to the front of the lens in a parabolic shape, which is quite similar to the fish's eyes, hence the name "fisheye lens". Fisheye lens is an optical imaging system with large field of view and large aperture. Generally, two or three negative meniscus lenses are used as the front light group to compress the large field of view of the object to the field of view required by conventional lenses.

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This answer comes from Baidu Encyclopedia.