"The Petzval objective or Petzval lens is the first photographic portrait objective lens (with a 160mm focal length) in the history of photography. It was developed by the German-Hungarian mathematics professor Joseph Petzval in 1840 in Vienna, with technical advice provided by Peter Wilhelm Friedrich von Voigtländer [de]. The Voigtländer company went on to build the first Petzval lens in 1840 on behalf of Petzval, whereupon it became known throughout Europe. Later, the optical instruments maker Carl Dietzler in Vienna also produced the Petzval lens." - (en.wikipedia.org 08.05.2022)
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