| Petzval-Voigtländer copper camera 1841, January Illustration Internet - Original source ill-defined Posted by Bálint Flesch to Facebook, "The Daguerreian Society" page (26 August 2015) LL/60980 Scheme January 1841. Voigtländer & Sohn camera with Petzval lens 1: 3,7 143 mm (Voigtländer Bildarchiv, Niedersächs, Staatsarchiv Wolfenbüttel)
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