Thomas Rudolphus Dallmeyer (1859–1906), English optician

Optics

Optics is the branch of physics which involves the behavior and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behavior of visible, ultraviolet, and infrared light...

, was the son of John Henry Dallmeyer

John Henry Dallmeyer

John Henry Dallmeyer , Anglo-German optician, was born at Loxten, Westphalia, the son of a landowner.On leaving school at the age of sixteen he was apprenticed to an Osnabrück optician, and in 1851 he came to London, where he obtained work with an optician, W Hewitt, who shortly afterwards, with...

 who ran an optics business.

He assumed control of the business on the failure of his father's health, was principally known as the first to introduce the telephoto lens

Telephoto lens

In photography and cinematography, a telephoto lens is a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length. This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus...

 into ordinary practice (patented 1891), and he was the author of a standard book on the subject (Telephotography, 1899). He served as president of the Royal Photographic Society

Royal Photographic Society

The Royal Photographic Society is the world's oldest national photographic society. It was founded in London, United Kingdom in 1853 as The Photographic Society of London with the objective of promoting the Art and Science of Photography...

in 1900-1903.
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