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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.
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.
Hale Telescope Palomar Obs. 200 inch 508 cm 1949 USA: 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]
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
List of largest optical reflecting telescopes – List of large optical telescopes; List of largest optical refracting telescopes; List of space telescopes; List of solar telescopes; List of telescope types; List of largest optical telescopes historically; List of largest optical telescopes in the 20th century
Telescope History Archived 2021-02-14 at the Wayback Machine, NASA Official Website, accessed 02/09/2019 History of the Telescope , accessed 02/09/2019 List of astronomical observatories and telescopes , Encyclopedia Britannica, 02/09/2019
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