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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.
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 dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .
Great refractor refers to a large telescope with a lens, usually the largest refractor at an observatory with an equatorial mount. The preeminence and success of this style in observational astronomy defines an era in modern telescopy [ 1 ] in the 19th and early 20th century. [ 1 ]
A 12-inch refractor was moved to Yerkes from Kenwood Observatory in the 1890s. [13] Two other telescopes planned for the observatory in the 1890s were a 12-inch aperture refractor and a 24-inch reflecting telescope. [13] There was a heliostat mirror and a meridian room for a transit instrument. [13]
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]
Spacewatch 1.8-meter Telescope [35] 1.80 m: 71″ Single: USA: Kitt Peak National Observatory, Arizona, USA: 2001 1.8m Ritchey Cretien reflector [36] 1.80 m: 72″ Single: Korea: Bohyunsan Optical Astronomy Observatory, Korea: 1996 Sandy Cross Telescope [37] 1.80 m: 71″ Single: Canada: Rothney Astrophysical Observatory, Alberta, Canada: 1996 ...