Wikipedia
Topogon
Topogon is a wide field (originally 100 degrees field of view), symmetrical photographic lens designed by Robert Richter in 1934 for Zeiss Carl FA. Lenses produced under the name Metrogon also cite the US patent of the Topogon design.
Topogon lenses have been produced in f numbers ranging from f/3.5 to f/15 in various focal lengths.