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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.
Thompson 26-inch Refractor [11] Royal Observatory, Greenwich, Great Britain [11] [12] Equatorial Group, Herstmonceux, Sussex [11] 66 cm (26") [11] 6.82 m [11] 1896: Manufactured by Sir Howard Grubb as a gift from Sir Henry Thompson; originally used at Greenwich on the same mount as a 30 inch reflector [12] Llano del Hato National Astronomical ...
Silvered glass mirrors were a vast improvement over speculum metal and made reflectors a practical instrument. The era of large reflectors had begun, with telescopes such as the 36-inch (91 cm) Crossley Reflector (1895), 60-inch (1.5 m) Mount Wilson Observatory Hale telescope of 1908, and the 100-inch (2.5 m) Mount Wilson Hooker telescope in 1917.
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an 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 a design that suffered from severe chromatic ...
A. A. Common's 36 inch Ealing reflector: 91.4 cm: 36" glass mirror reflector: First to prove fainter than naked eye astrophotography; [11] sold, became Crossley Reflector: A. A. Common Reflector, Great Britain / Lick Observatory, California, USA: 1879 Great Melbourne Telescope [12] 1.22 m: 48" speculum metal mirror reflector
Aperture of the primary mirror alone can be poor measure of a reflective telescope's significance; for example, the Hubble Space Telescope has only a 2.4 metres (94 in) primary mirror. In addition, many large or significant telescopes are not optical and/or reflecting.
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