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Hooker Telescope Mount Wilson Obs. 100 inch 254 cm 1917 USA: McDonald Obs. 82 inch i.e. Otto Struve Telescope: 82 inch 208 cm 1939 USA: David Dunlap Observatory: 74 inch 188 cm 1935 Canada: Plaskett telescope Dominion Astrophysical Obs. 72 inch 182 cm 1918 Canada: 69-inch Perkins Telescope [10] Perkins Observatory: 69 inch 175 cm: 1931–1964 USA
Largest Visible-light space based telescope: Low Earth orbit NASA+ ESA: 1990 BTA-6: 6 m: 238" glass mirror reflector: World's largest 1976: Zelenchukskaya, Caucasus: 1976 McMath-Pierce Solar Telescope: 1.61 m: 63" glass mirror reflector: Largest solar telescope: Kitt Peak National Obs., USA: 1962 Hale Telescope (200 inch) 5.08 m: 200" glass ...
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes . This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
The observatory contains two historically important telescopes: the 100-inch (2.5 m) Hooker telescope, which was the largest aperture telescope in the world from its completion in 1917 to 1949, and the 60-inch telescope which was the largest operational telescope in the world when it was completed in 1908.
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. Space-based telescopes , such as the Hubble Space Telescope , take advantage of being above the Earth's atmosphere to reach higher resolution and greater light gathering through ...
Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror telescopes. The technology for silver-coating glass mirrors, more reflective than speculum metal and not subject to tarnishing, was developed in the mid-19th century but was slow to be adopted.
This happened during testing of an 18.5-inch (470 mm) aperture great refractor telescope for Dearborn Observatory, which was one of the largest refracting telescope lens in existence at the time, and the largest telescope in the United States. [20] A 25-inch (63.5 cm) objective refractor was installed in the Newall telescope. [18]
The history of the Dearborn Observatory coincides with the founding of the Chicago Astronomical Society in 1862. [4] The society heard of the 1861 construction of a 469.9 millimetres (18.50 in) lens for a telescope, which made it, at the time, the largest refracting telescope in the world.