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Porro prism binoculars were made in such a way to erect an image in a relatively small space, thus binoculars using prisms started in this way. Porro prisms require typically within 10 arcminutes ( 1 / 6 of 1 degree) tolerances for alignment of their optical elements (collimation) at the factory.
When the two mirrors are on one mount, the combined mirror spacing of the Large Binocular Telescope (22.8 m) allows fuller use of the aperture synthesis. Largest does not always equate to being the best telescopes, and overall light gathering power of the optical system can be a poor measure of a telescope's performance.
Mother of pearl opera glasses and leather case. Opera glasses with handle, ca.1910. Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances.
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Minox (pronounced / ˈ m iː n ɒ k s / MEE-noks) is a manufacturer of cameras, known especially for its subminiature camera.. The first product to carry the Minox name was a subminiature camera, conceived in 1922, and finally produced in 1936, by Baltic German Walter Zapp. [1]
One of REL's best known products were their binoculars. A common 6x30 set was produced to the extent of about 50,000 examples, while a 7x50 set added another 25,000 examples. A very small number, about six, of an experimental 20x72 were also built. [28] Another well known REL product was a series of telescopic sights for the Lee–Enfield No. 4 ...
Recognized by the Guinness World Records as the World's Shortest Living Woman. [17] 1993– South Africa: 65 cm (26 in) Madge Bester: Former smallest living woman. [18] 1963–2018 Mexico: 68 cm (26.8 in) Lucía Zárate: Zárate claimed in her lifetime that she was only 50.8 cm (20.0 in), and was exhibited for her small stature.
This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time. In 1900 a 1-meter reflector would be among the largest in the world, but by 2000, would be relatively common for professional observatories.
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