The Voigtländer objectives were revolutionary because they were the first mathematically calculated precision objectives in the history of photography, developed by the German-Hungarian mathematics professor Josef Maximilian Petzval, with technical advice provided by Peter Voigtländer. Voigtländer went on to produce the first Petzval portrait photographic lens (the fastest lens at that time: f/3.6) in 1840, and the world's first all-metal daguerreotype camera (Ganzmetallkamera) in 1840, also bringing out photographic plate cameras shortly afterwards.