Ludwig Bertele
| Ludwig Jakob Bertele | |
|---|---|
 |
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| Born |
25 December 1900 Munich, Germany |
| Died | 16 November 1985 (aged 84) Wildhaus, Switzerland |
| Occupation | optics engineer, optics constructor |
Ludwig Jakob Bertele (25 December 1900 – 16 November 1985) was a German optics constructor. His developments received universal recognition and serve as a basis for considerable part of the optical designs used today.
Ludwig Jakob Bertele was born 25 December 1900 in Munich, to an architect’s family.
In 1916 he began to work as an assistant of optics designer in firm in Munich. In 1919 he went to Dresden to work in Ernemann Company (Krupp-Ernemann Kinoapparate AG). He worked there under the supervision of August Klughardt as designer of optics.
In 1919 Ludwig Bertele started to develop a type of optical scheme, subsequently known as Ernostar. He has taken for a basis an optical scheme of cinema lens Ultrastigmat, a modified triplet, which was calculated by Charles C. Minor in 1916 and being produced by Gundlach Company. The main purpose was the increasing of light-gathering power and diminution of aberration.
In 1923, after four years of intensive efforts, he has patented his first ultra high-aperture objective Ernostar f/2, its successive versions followed until 1926. That lens was fitted to the Ermanox camera, which was specially developed for photo reportage. This was the first camera having sufficient speed and image quality for candid photography in available light conditions. The pictures of prominent political figures taken with it by Erich Salomon are widely known.
After the foundation of Zeiss Ikon in 1926, as a result of integration of companies ICA (Internationale Camera Actiengesellschaft), Optische Anstalt CP Goerz, Contessa-Nettel and Ernemann-Werke with Carl Zeiss, Ludwig Bertele continued his work in Dresden except for a short trip to United States in 1929. An experimental optical workshop was given at the disposal of Bertele. That shop made all examples and prototypes of Bertele's calculations. Every lens got a unique five-cipher number; often a current number of the variant was also engraved.
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