English: This is a diagram for a fish-eye lens which has 11 elements in 8 groups, redrawn from the geometry listed for Embodiment 2 in US Patent 4,412,726, which was the basis for the Minolta MC Fish-Eye Rokkor-OK of 1969. The same design was used for the Leica Fisheye-Elmarit-R and the Minolta AF Fish-Eye, all fisheye lenses with a focal length of 16mm and maximum aperture of f/2.8.
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