Zeiss Biogon

[4] Symmetric wide-angle lenses with meniscus elements facing the object and image had been developed in the 1930s, including the Schneider Kreuznach Angulon (Tronnier, 1930) with two outer negative menisci,[5] derived from the Goerz Dagor (Emil von Höegh, 1892);[10]: 92  and the Zeiss Topogon (Richter, 1933) with two outer positive menisci,[6] derived from the Goerz Hypergon (1900).

[11]: 54–55 [3]: 118–119  These concepts were combined in a symmetric super-wide angle lens design using mirrored inverted telephoto lenses, as patented by Roosinov in 1946.

[12]: 150 In 1950, Bertele designed the Wild Aviogon as a similar highly-symmetric wide-angle lens with a large angular coverage.

[13] Since their introduction, lenses branded Biogon are usually approximately symmetrical ("semi-symmetrical") wide-angle design with a usable angle of view of 90° or more.

The Super-Angulon bears more similarities to the prior Angulon, designed by Albrecht Tronnier for Schneider in 1930 as another highly symmetric wide-angle lens with two cemented triplets.

Leica CL with Carl Zeiss Biogon 2,8 / 28 mm lens
Zeiss Biogon 2,8 / 21 mm lens