Difference between revisions of "Topogon"
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| − | The Topogon is an extra-wide field photographic lens of a double-Gauss design with an extremely curved meniscus to provide a 90° field of view. The lens is symmetrical front to back. The two outer positive elements are of high index crown glass while the two inner negative elements are of a high index flint glass. The lens was designed in 1933 by Robert Richter for [[Carl Zeiss]], Jena.<ref>[http://ip.com/patent/US2031792 US Patent US 2031792]</ref> | + | The '''Topogon''' is an extra-wide field photographic lens of a double-Gauss design with an extremely curved meniscus to provide a 90° field of view. The lens is symmetrical front to back. The two outer positive elements are of high index crown glass while the two inner negative elements are of a high index flint glass. The lens was designed in 1933 by Robert Richter for [[Carl Zeiss]], Jena.<ref>[http://ip.com/patent/US2031792 US Patent US 2031792]</ref> |
In the U.S.A. the lens was copied by [[Bausch & Lomb]] and sold as the [[Metrogon]], which found widespread use in [[Aerial camera | aerial cameras]]. | In the U.S.A. the lens was copied by [[Bausch & Lomb]] and sold as the [[Metrogon]], which found widespread use in [[Aerial camera | aerial cameras]]. | ||
Latest revision as of 09:29, 30 October 2013
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| Robert Richter Patent for the Topogon image by Dirk HR Spennemann (Image rights) |
The Topogon is an extra-wide field photographic lens of a double-Gauss design with an extremely curved meniscus to provide a 90° field of view. The lens is symmetrical front to back. The two outer positive elements are of high index crown glass while the two inner negative elements are of a high index flint glass. The lens was designed in 1933 by Robert Richter for Carl Zeiss, Jena.[1] In the U.S.A. the lens was copied by Bausch & Lomb and sold as the Metrogon, which found widespread use in aerial cameras.
