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The first types of fisheye lenses developed were "circular" — lenses which took in a 180° hemisphere and projected it as a circle within the film frame. By design, circular fisheye lenses thus cover a smaller image circle than rectilinear lenses designed for the same sensor size. The corners of a circular fisheye image will be completely black.
A Luneburg lens (original German Lüneburg lens) is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index n decreases radially from the center to the outer surface. They can be made for use with electromagnetic radiation from visible light to radio waves. For certain index profiles, the lens will form perfect ...
The two halves are divided by a band of tissue and the eye has two pupils, connected by part of the iris. The upper half of the eye is adapted for vision in air, the lower half for vision in water. [35] The lens of the eye changes in thickness top to bottom to account for the difference in the refractive indices of air versus water. These fish ...
Fisheye lenses, which take hemispherical views, utilize this type of distortion as a way to map an infinitely wide object plane into a finite image area. In a zoom lens, barrel distortion appears in the middle of the lens's focal length range and is worst at the wide-angle end of the range. [2]
A fisheye lens is a special type of ultra-wide angle retrofocus lens with little or no attempt to correct for rectilinear distortion. Most fisheyes produce a circular image with a 180° field of view. The term fisheye comes from the supposition that a fish looking up at the sky would see in the same way. [1]: 145
Samyang 7.5mm F3.5 UMC Fisheye MFT. Samyang 8mm f/3.5 Fisheye CS II. Samyang 8mm F2.8 UMC Fisheye. Samyang 8mm f3.5 fisheye. Samyang 12mm F2.8 ED AS NCS Fish-eye. Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM lens. Sigma 8mm f/3.5 EX DG lens. Sigma 8mm f/4 EX DG lens. Sigma 10mm f/2.8 EX DC Fisheye HSM lens.
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