Dallmeyer, Thomas Rudolphus

Dallmeyer, Thomas Rudolphus
b. May 1859
d. 25 December 1906
English camera-lens designer.
The second son of J.H. Dallmeyer, after graduating at King's College he joined his father's factory, learning lens grinding and optical brass-work manufacture. When his father retired because of ill health in 1882, he took over the business, in which he remained active until his death. He made many improvements in lens design, chiefly in his introduction of the first practical telephoto lens in 1891, for which he received the Progress Medal of the Royal Photographic Society in 1896. He also developed a number of variable focal length lenses, including the soft-focus Bergheim Portrait lens of 1896.

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

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