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When Thomas was twenty-one, his father went on a long voyage to recuperate from overwork but died during the journey. Thomas took over and not only maintained the reputation of the lenses his father had designed but he continually improved them and added new patterns. Among his principal inventions
141:. He also designed the Dallmeyer-Bergen lens, which was the prototype of the anachromatic lenses. It was suggested by a painter, J.S. Bergheim, who wished for a lens which would give him correct drawing and soft definition without sacrificing the natural structure of the original.
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was the first practical telephoto lens (patented 1891) which he afterwards elaborated into many special forms for various purposes, a rapid landscape lens, a rectilinear landscape lens, some of the earliest rapid lenses made with lenses from
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He married Julia Fanny Thomas (died 26 September 1936), daughter of
Charles Thomas Lt 54 Bengal Infantry, on 13 January 1886.
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who ran an optics business. His maternal grandfather, Andrew Ross, was himself the first
English photographic optician.
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Telephotography: an elementary treatise on the construction, and application of the telephotographic lens
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One or more of the preceding sentences incorporates text from a publication now in the
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He was the author of a standard book on the subject of telephoto lenses,
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95:(16 May 1859 – 25 December 1906), English
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Dallmeyer, John Henry s.v. Thomas
Rudolphus Dallmeyer
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207:"Obituary; Thomas Rudolphus Dallmeyer" (1907)
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67:Nationality
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83:Occupation
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75:Education
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97:optician
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86:optics
155:Notes
135:Jena
107:Life
55:Died
40:Born
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