|Thomas Rudolphus Dallmeyer|
|Born||16 May 1859|
|Died||25 December 1906 47)(aged|
|Education||Mill Hill School|
Thomas Rudolphus Dallmeyer (16 May 1859 – 25 December 1906),English optician, was the son of John Henry Dallmeyer who ran an optics business. His maternal grandfather, Andrew Ross, was himself the first English photographic optician.
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.
John Henry Dallmeyer, Anglo-German optician, was born at Loxten, Westphalia, the son of a landowner.
After attending other schools, Thomas enrolled at Mill Hill School where he came under the tutelage of Dr. J.A.H. Murray who is best known as an editor of the Oxford English Dictionary . After leaving school, he entered his father's optometry business, while learning the theoretical side from Oliver Lodge.
Mill Hill School is a 13–18 mixed independent, day and boarding school in Mill Hill, London, England that was established in 1807. It is a member of the Headmasters' and Headmistresses' Conference.
The Oxford English Dictionary (OED) is the principal historical dictionary of the English language, published by Oxford University Press. It traces the historical development of the English language, providing a comprehensive resource to scholars and academic researchers, as well as describing usage in its many variations throughout the world. The second edition, comprising 21,728 pages in 20 volumes, was published in 1989.
Sir Oliver Joseph Lodge, was a British physicist and writer involved in the development of, and holder of key patents for, radio. He identified electromagnetic radiation independent of Hertz' proof and at his 1894 Royal Institution lectures, Lodge demonstrated an early radio wave detector he named the "coherer". In 1898 he was awarded the "syntonic" patent by the United States Patent Office. Lodge was Principal of the University of Birmingham from 1900 to 1920.
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 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 Jena, Germany, and the Adon and Junior Adon telephoto lenses. He also invented the Naturalist's Camera for which he received the medal of the Royal Photographic Society. 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.
Jena is a German university city and the second largest city in Thuringia. Together with the nearby cities of Erfurt and Weimar, it forms the central metropolitan area of Thuringia with approximately 500,000 inhabitants, while the city itself has a population of about 110,000. Jena is a centre of education and research; the Friedrich Schiller University was founded in 1558 and had 18,000 students in 2017 and the Ernst-Abbe-Fachhochschule Jena counts another 5,000 students. Furthermore, there are many institutes of the leading German research societies.
The Royal Photographic Society of Great Britain, commonly known as the Royal Photographic Society (RPS), is one of the world's oldest photographic societies. It was founded in London, England, in 1853 as The Photographic Society of London with the objective of promoting the art and science of photography, and in 1854 received Royal patronage from Queen Victoria and Prince Albert. A change to the society's name to reflect the Royal patronage was, however, not considered expedient at the time. In 1874 it was renamed the Photographic Society of Great Britain, and from 1894 it became known as The Royal Photographic Society of Great Britain. A registered charity since 1962, in July 2004, The Royal Photographic Society of Great Britain was granted a Royal charter recognising its eminence in the field of photography as a learned society. For most of its history the Society was based at various premises in London. It moved to Bath in 1979, and since 2004 its headquarters has been at Fenton House in Bath, England. Membership is international and open to anyone with an interest in photography.
He was the author of a standard book on the subject of telephoto lenses, Telephotography (1899).He served as president of the Royal Photographic Society in 1900-1903.
He married Julia Fanny Thomas (d. 26 September 1936), daughter of Charles Thomas Lt 54 Bengal Infantry, on 13 January 1886.
"The Dallmeyer-Bergen portrait lens is a simple telephoto composed of a single uncorrected lens, and the softness of definition is regulated by the diaphragm which is in front of all the glasses. It gives beautiful soft-focus effects without having to move the camera."— American Photography, Vol. 15, (1921) p.558
A camera is an optical instrument to capture still images or to record moving images, which are stored in a physical medium such as in a digital system or on photographic film. A camera consists of a lens which focuses light from the scene, and a camera body which holds the image capture mechanism.
The f-number of an optical system is the ratio of the system's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. It is also known as the focal ratio, f-ratio, or f-stop. It is the reciprocal of the relative aperture. The f-number is commonly indicated using a hooked f with the format f/N, where N is the f-number.
In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as disk of confusion, circle of indistinctness, blur circle, or blur spot.
A camera lens is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.
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 lens in a much shorter overall design. The angle of view and other effects of long-focus lenses are the same for telephoto lenses of the same specified focal length. Long-focal-length lenses are often informally referred to as telephoto lenses although this is technically incorrect: a telephoto lens specifically incorporates the telephoto group.
Subminiature photography is photographic technologies and techniques working with film material smaller in size than 35mm film, such as 16mm, 9.5mm, 17mm, or 17.5mm films. It is distinct from photomicrography, photographing microscopic subjects with a camera which is not particularly small.
A zoom lens is a mechanical assembly of lens elements for which the focal length can be varied, as opposed to a fixed focal length (FFL) lens.
In film and photography, a prime lens is a fixed focal length photographic lens, typically with a maximum aperture from f2.8 to f1.2. The term can also mean the primary lens in a combination lens system. Confusion between these two meanings can occur if context doesn't make the interpretation clear. People sometimes use alternate terms—primary focal length, fixed focal length, or FFL to avoid ambiguity.
In photography, a tripod is used to stabilize and elevate a camera, a flash unit, or other photographic equipment. All photographic tripods have three legs and a mounting head to couple with a camera. The mounting head usually includes a thumbscrew that mates to a female threaded receptacle on the camera, as well as a mechanism to be able to rotate and tilt the camera when it is mounted on the tripod. Tripod legs are usually made to telescope, in order to save space when not in use. Tripods are usually made from aluminum, carbon fiber, steel, wood or plastic.
Wildlife photography is a genre of photography concerned with documenting various forms of wildlife in their natural habitat.
Moritz von Rohr was an optical scientist at Carl Zeiss in Jena, Germany.
Nature photography is a wide range of photography taken outdoors and devoted to displaying natural elements such as landscapes, wildlife, plants, and close-ups of natural scenes and textures. Nature photography tends to put a stronger emphasis on the aesthetic value of the photo than other photography genres, such as photojournalism and documentary photography.
In photography, a rectilinear lens is a photographic lens that yields images where straight features, such as the walls of buildings, appear with straight lines, as opposed to being curved. In other words, it is a lens with little or no barrel or pincushion distortion. At particularly wide angles, however, the rectilinear perspective will cause objects to appear increasingly stretched and enlarged as they near the edge of the frame. These types of lenses are often used to create forced perspective effects.
"Tilted plane photography" is a method of employing focus as a descriptive, narrative or symbolic artistic device. It is distinct from the more simple uses of selective focus which highlight or emphasise a single point in an image, create an atmospheric bokeh, or miniaturise an obliquely-viewed landscape. In this method the photographer is consciously using the camera to focus on several points in the image at once while de-focussing others, thus making conceptual connections between these points.
Landscape photography shows spaces within the world, sometimes vast and unending, but other times microscopic. Landscape photographs typically capture the presence of nature but can also focus on man-made features or disturbances of landscapes.
The French firm Susse Frères manufactured a daguerreotype camera which was one of the first two photographic cameras ever sold to the public. The company was also engaged in the foundry business and owned a large foundry in Paris.
Alfred Horsley Hinton was an English landscape photographer, best known for his work in the pictorialist movement in the 1890s and early 1900s. As an original member of the Linked Ring and editor of The Amateur Photographer, he was one of the movement's staunchest advocates. Hinton wrote nearly a dozen books on photographic technique, and his photographs were exhibited at expositions throughout Europe and North America.
The 35 mm format, or simply 35 mm, is the common name for the 36×24 mm film format or image sensor format used in photography. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43 mm. It has been employed in countless photographic applications including single-lens reflex (SLR) cameras, rangefinder cameras, mirrorless interchangeable-lens digital cameras, digital SLRs, point-and-shoot film cameras, and disposable film cameras.
Harold Armytage Sanders, F.R.P.S. also known by the full name Harold Armytage Thomas Sanders, was father of World War I photographer Henry Armytage Bradley Sanders of New Zealand fame. As an optician he worked for W. Watson and Son. He went into business with Crowhurst with the business named Sanders and Crowhurst, and then was in business by himself as Sanders and Company.
The public domain consists of all the creative works to which no exclusive intellectual property rights apply. Those rights may have expired, been forfeited, expressly waived, or may be inapplicable.
The Encyclopædia Britannica Eleventh Edition (1910–11) is a 29-volume reference work, an edition of the Encyclopædia Britannica. It was developed during the encyclopaedia's transition from a British to an American publication. Some of its articles were written by the best-known scholars of the time. This edition of the encyclopedia, containing 40,000 entries, is now in the public domain, and many of its articles have been used as a basis for articles in Wikipedia. However, the outdated nature of some of its content makes its use as a source for modern scholarship problematic. Some articles have special value and interest to modern scholars as cultural artifacts of the 19th and early 20th centuries.