By 1915 the company had outgrown its buildings and moved to new premises in another part of Braunschweig.
sold shares on the stock market, becoming Voigtländer AG).
In 1898 the company, until then family-owned, became a public company (i.e. In 1849 Voigtländer built a branch factory in Braunschweig (Brunswick) in Germany under the name Voigtländer & Sohn, Optical Institute, and in 1862 the company moved its headquarters to Braunschweig. Voigtländer also made cameras, including the first all-metal daguerrotype camera. The design was widely adopted, and Petzval lenses were made for about the next century. The lens' main limitation (it only covers a narrow field of view) prevented it being adapted for other uses (landscape, for example), but does not matter for portraiture. The wide aperture allowed a very considerable reduction in exposure times. The lens, with the widest relative aperture of any then made (about f/3), was very successful for its intended purpose: the making of daguerreotype portraits. In 1840, the Hungarian Josef Petzval designed the innovative Petzval lens for Voigtländer. In the 19th century, Voigtländer made optical products including opera glasses and periscopic lenses. Another son, Friedrich Voigtländer, took control in 1808. Voigtländer died in 1797, and the company passed to his widow and two eldest sons, Wilhelm and Siegmund. to measure and divide distances and angles with great precision) which were used for calibrating surveying and navigational instruments including astrolabes. For example, Voigtländer invented instruments for linear and circular measure (i.e. Voigtländer was an optician and inventor, noted for his work on mathematical instruments, and held letters patent (a state-protected monopoly, the forerunner of a Patent) from the Austrian government, granting an exclusive right to carry on that business. Voigtländer was founded in 1756 in Vienna, Austria by Johann Christoph Voigtländer, as a scientific instrument maker. Image by eBayer Yalluflex ( Image rights) pronunciation "FOYKT-lender") was one of the the world's longest-lived camera and lens makers.
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