A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a...

The next largest refractor telescopes are the James Lick telescope, and the Meudon Great Refractor. Most are classical great refractors, which used achromatic...

reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. In the 20th...

lens refracting telescope, the second-largest refractor ever successfully used for astronomy. The largest lens is the Swedish 1-m Solar Telescope. There...

the Trophy Telescope at the 1851 Great Exhibition, and the Yerkes Great Refractor at the 1893 World's Fair in Chicago. A great refractor was often the...

Yerkes Observatorys' 40-inch (100 cm) refractor (although a larger refractor Great Paris Exhibition Telescope of 1900 with an objective of 49.2 inches...

Atmospheric Cherenkov telescope used to detect gamma rays Infrared telescope Radio telescope Submillimeter telescope Ultraviolet telescope (see also Ultraviolet...

The Greenwich 28-inch refractor is a telescope at the Royal Observatory, Greenwich, where it was first installed in 1893. It is a 28-inch ( 71 cm) aperture...

20" refractor telescope (28 ft focal length), commissioned in 1914 from Warner & Swasey, with optics by John Brashear. It is the largest refractor in the...

types of optical telescope: Refracting telescopes, which use lenses and less commonly also prisms (dioptrics) Reflecting telescopes, which use mirrors...

Fry telescope, an 8" refractor manufactured in 1862, is in regular use at the University of London Observatory in Mill Hill, London. A 10" refractor from...

houses a digital planetarium as well as an historic 93⁄4-inch Cooke refractor telescope, through which evening visitors can observe a variety of Solar System...

than other telescope designs (Gregorians, cassegrains, and early refractors had two surfaces that need figuring. Later achromatic refractor objectives...

Refractor (also known as the Grande Lunette) is a double telescope with lenses (83 cm + 62 cm), in Meudon, France. It is a twin refracting telescope built...

eastward near the predicted location of Apollo 8. He used a 60 cm refractor telescope to observe a cluster of objects which were obscured by the appearance...

(16 in) Schmidt-Cassegrain telescope and an historic 29-centimetre (11 in) refractor telescope built in 1874, the oldest telescope in Australia in regular...

Photographic Refractor (c.1888) Sheepshanks refractor 6.7-inch (1838) (aka Sheepshanks Equatorial) 6-inch Franklin Adams Camera (1898) Shuckburgh telescope a 4...

image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was...

Berlin, though the Einstein Tower solar observatory and the great refractor telescope on Telegrafenberg in Potsdam belong to the AIP. The key topics of...

reflecting telescope at the Yerkes Observatory, that was completed in 1968. It is known as the 41 inch to avoid confusion with a 40 inch refractor at the...

others, among the first to use a refracting telescope as an instrument to observe stars, planets or moons. The name "telescope" was coined for Galileo's instrument...

Melbourne Telescope (a reflecting telescope) in 1868, a 27-inch (0.69 m) refractor for the Vienna Observatory in 1878, and the Greenwich 28 inch refractor in...

1880s). In the records for the largest refracting telescopes, all three were outperformed by the 91 cm (36 in) refractor installed at the Lick Observatory...

"Harvard College Observatory: Great Refractor". www.cfa.harvard.edu. Retrieved September 8, 2019. "Fitz/Clark 12-in Refractor". The General History of Astronomy...

Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use...

solved in a different way by reflecting designs). Telescopes The Great Refractor, a great refractor telescope with an objective diameter (60 cm) and focal...

cause irregular refraction. In the thicker and larger glasses, there would be even more of such defects, so that in larger telescopes this kind of glass...

a new larger refractor, the 28-inch Grubb in the Great Equatorial Dome. Because the new telescope was longer than the old Great refractor, the new dome...

sag is to place the telescope in orbit around the Earth. The technical limit concerning lens sag was reached at the Yerkes refractor (1897) with an aperture...

Telescopes with aperture diameter >8 metres This list of the largest optical reflecting telescopes with objective diameters of 3.0 metres (120 in) or greater...