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2. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. [4][5]: 145 Fisheye lenses achieve extremely wide angles of view, well beyond any rectilinear lens. Instead of producing images with straight lines of perspective (rectilinear images), fisheye lenses use ...

3. Underwater vision - Wikipedia

   en.wikipedia.org/wiki/Underwater_vision

   Underwater vision. Scuba diver with bifocal lenses fitted to a mask. Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water.

4. Pentax F 17-28mm lens - Wikipedia

   en.wikipedia.org/wiki/Pentax_F_17-28mm_lens

   The smc Pentax-F 17–28mm Fish-eye f / 3.5–4.5 is the first fisheye zoom lens, manufactured by Pentax for single-lens reflex cameras (SLRs) with a K lens mount.At its widest setting of 17mm, it affords a 180° diagonal angle of view images for all K-mount full-frame SLR cameras; at 28mm, the diagonal angle of view is reduced to 90° on the diagonal.

5. Sigma 8mm f/4 EX DG lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_8mm_f/4_EX_DG_lens

   Vertical. 180. Diagonal. 180. History. Successor. Sigma 8mm f/ 3.5 EX DG. The Sigma 8mm f/4 EX DG is a photographic lens made by the Sigma Corporation. It is a circular fisheye lens for full-frame cameras, and has been replaced by the Sigma 8mm f/ 3.5 EX DG .

6. Panomorph - Wikipedia

   en.wikipedia.org/wiki/Panomorph

   A panomorph lens is a particular type of wide-angle lens specifically designed to improve optical performances in predefined zones of interest, or across the whole image, compared to traditional fisheye lenses. [1] [predatory publisher] Some examples of improved optical parameters include the number of pixels, the MTF or the relative illumination.

7. Minolta AF Fish-Eye 16mm f/2.8 - Wikipedia

   en.wikipedia.org/wiki/Minolta_AF_Fish-Eye_16mm_f/2.8

   Originally produced by Minolta, and currently produced by Sony, the AF Fish-Eye 16mm, is a prime Fisheye lens compatible with cameras using the Minolta A-mount and Sony A-mount lens mounts. It is a full-frame fisheye lens with a 180° viewing angle. The front of the lens does not have a mount for filters. Rather a number of filters are built in ...