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2. Minolta UW Rokkor 18mm f/9.5 - Wikipedia

   en.wikipedia.org/wiki/Minolta_UW_Rokkor_18mm_f/9.5

   The UW Rokkor 18mm f/9.5 is a prime fisheye lens produced by Minolta for Minolta SR-mount single lens reflex cameras, introduced in 1966 as the system's first fisheye lens.It is a full-frame fisheye lens with a 180° viewing angle across the diagonal, and was replaced when the Minolta Fish-Eye Rokkor 16mm f/2.8 lens was released in 1969.

3. 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 ...

4. Minolta Fish-Eye Rokkor 16mm f/2.8 - Wikipedia

   en.wikipedia.org/wiki/Minolta_Fish-Eye_Rokkor_16...

   1969. Predecessor. UW Rokkor 18mm f/9.5. Successor. AF Fish-Eye 16mm f/2.8. The Fish-Eye Rokkor 16mm f/2.8 is a prime fisheye lens produced by Minolta for Minolta SR-mount single lens reflex cameras, introduced in 1969 to replace an earlier fisheye lens, the UW Rokkor 18mm f/9.5. It is a full-frame fisheye lens with a 180° viewing angle across ...

5. Luneburg lens - Wikipedia

   en.wikipedia.org/wiki/Luneburg_lens

   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 ...

6. History of photographic lens design - Wikipedia

   en.wikipedia.org/wiki/History_of_photographic...

   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

7. List of Minolta A-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Minolta_A-mount_lenses

   Fisheye lens; first 600 units used a different barrel construction internally; [17] optically similar to the Minolta MC Fish-Eye Rokkor 16mm f / 2.8 (a.k.a. Leica Fisheye-Elmarit-R 16mm f / 2.8) produced up to 1981 with an optical design originally introduced in 1966/1968. Minolta AF Fish-Eye 16mm f / 2.8 (later revision) 2578-110, 2578-610 [19 ...