What do fish eyes do?

An organ that can perceive light. The simplest eye structure can detect the brightness of the surrounding environment, and the more complex eye structure can provide vision. Fisheyes are usually located on both sides of the head, and most of them have no eyelids and cannot be closed. The lens of the eye is spherical. What does visual adjustment depend on? The position of the lens moves back and forth instead of changing the convexity of the lens. Therefore, fisheye is extremely nearsighted.

Usually the eyes are spherical, filled with transparent gel-like substances, with a lens for focusing and usually an iris to control the amount of light entering the eyes.

Extended data

Application of fisheye bionics;

The focal length of the fisheye lens is between 6- 16mm, and the viewing angle is mostly above 180 degrees, and some can even reach 230 degrees. In order to make the lens reach the maximum shooting angle, the front lens of this lens is parabolic and protrudes forward, which is quite similar to the fish's eyes, so it is called fisheye lens. Most fisheye lenses are fixed-focus lenses, and only a few are zoom lenses.

When you hold the fisheye lens to eye level and shoot straight ahead, this lens will capture everything in the hemispherical space in front of you, even your own feet. This kind of image usually forms a circle in the frame instead of filling the rectangular frame.

Obviously, the fisheye lens is a special effect lens with great distortion. The perspective line radiates from the center in all directions, and the picture remains straight except for the straight line passing through the center. The straight lines in other parts are curved. High-quality fisheye lenses are very expensive, while low-priced ones are often of poor quality.

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