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He started as a portrait painter and engraver (c.1830s–1850s), and at the age of 40 became involved in telescope making. Using glass blanks made by Chance Brothers of Birmingham, England, and Feil-Mantois of Paris, France, his firm Alvan Clark & Sons ground lenses for refracting telescopes.
Hans Lipperhey is known for the earliest written record of a refracting telescope, a patent he filed in 1608. [ 1 ] [ 2 ] His work with optical devices grew out of his work as a spectacle maker, [ 3 ] an industry that had started in Venice and Florence in the thirteenth century, [ 4 ] and later expanded to the Netherlands and Germany.
Bioptics, also known as a bioptic in the singular, and sometimes more formally termed a bioptic telescope, is a term for a pair of vision-enhancement lenses. They magnify between two and six times, and are used to improve distance vision for those with severely impaired eyesight, especially those with albinism .
The company was founded in 1957 by instrument maker Helmut Schmidt and master instrument maker Helmut Bender. The company started with producing telescopic sights for large German (mail order) hunting equipment sales chains under various brand names and gradually started to produce telescopic sights under their own brand name.
The main material used early on for reflecting telescope mirrors was speculum metal, which reflected only about two-thirds of the incident light, and which tarnished, requiring maintenance. Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror ...
William Parsons, 3rd Earl of Rosse KP FRS (17 June 1800 – 31 October 1867), was an English engineer and astronomer.He built several giant telescopes. [1] [2] His 72-inch telescope, built in 1845 and colloquially known as the "Leviathan of Parsonstown", was the world's largest telescope, in terms of aperture size, until the early 20th century. [3]
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