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.[1] 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.[2]

External links

References

  1. ↑ http://ip.com/patent/US2031792
  2. ↑ http://www.marcocavina.com/articoli_fotografici/Hypergon_Topogon_Biogon_Hologon/00_pag.htm
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