A fisheye lens is a lens with a focal length of 16 mm or shorter and a viewing angle close to or equal to 180°. It is an extreme wide-angle lens, "fisheye lens" is its common name. In order to maximize the camera's viewing angle, the front lens of this photographic lens has a short diameter and protrudes toward the front of the lens in a parabolic shape, which is quite similar to the eyes of a fish. The fisheye lens is an ultra-large field of view and large aperture optical imaging system. Generally, two or three negative meniscus lenses are used as the front light group to compress the object-side super large field of view to the field of view required by conventional lenses.
Fisheye lens function:
The biggest effect of the fisheye lens is the wide viewing angle range, which can generally reach 220° or 230°, which creates the conditions for shooting a large range of scenes at close range; the fisheye lens can cause a very strong perspective effect when shooting close to the subject , Emphasizing the contrast between the near and far distances of the subject, so that the captured image has a shocking appeal; the fisheye lens has a very long depth of field, which is conducive to expressing the long depth of field effect of the photo. There are two kinds of fisheye lens imaging, one is like other lenses, the imaging is full of the picture; the other is circular. No matter what kind of imaging, the image taken with the fisheye lens is quite deformed and has a strong sense of perspective convergence. Therefore, it is often used as a special effect lens. An arm that extends toward the fisheye lens will appear twice as long as the original one.
Fisheye lens has a large field of view, so it is widely used in scene monitoring, satellite positioning, robot navigation, tiny intelligent systems and engineering surveying. Because fisheye lenses can achieve full airspace containment and full time domain real-time information acquisition, especially in line with the needs of modern warfare for information acquisition technology, which is unmatched by other photoelectric detection methods, so fisheye lenses are used in defense and military The field has also received important applications.
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