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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.
Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
Production and sales of the telescope ceased in 2013 when the mold for the plastic body broke. In 2016 the Edmund Scientific website, now called Scientifics Direct, began offering a more common format altitude-azimuth mounted 4.5 inch table-top Newtonian telescope labeled the "Astroscan Millennium".
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