Dallmeyer, John Henry

[br]
b. 6 September 1830 Loxten, Westphalia, Germany
d. 30 December 1883 at sea off New Zealand
[br]
German/English manufacturing optician and, lens designer.
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Son-in-law of the great optician Andrew Ross, for whom he worked, Dallmeyer founded his own business in 1860, in which year he introduced his triple achromat lens, which combined the features of a flat field, high definition, a wide angle of view and straight marginal lines, eliminating both the barrel distortion given by the single achromat and the pincushion distortion of the orthochromatic lens. In 1866 he patented the Rectilinear lens, a double achromat pattern which remained in use for over half a century. His portrait lenses, based on the Petzval pattern, were widely used throughout the nineteenth century in studios around the world. Ill health forced Dallmeyer's retirement from business in 1882.
BC

Biographical history of technology. - Taylor & Francis e-Librar. . 2005.

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