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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.
A. A. Common Reflector, Great Britain / Lick Observatory, California, USA: 1879 Great Melbourne Telescope [12] 1.22 m: 48" speculum metal mirror reflector: Last large reflector with a speculum metal mirror, world's largest equatorially mounted telescope for several decades. [13] Melbourne Observatory, Melbourne, Australia: 1868–1889 Foucault ...
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.
For telescopes below 3 meters see List of large optical telescopes: Refractors ... Wyeth 61" reflector [11] Oak Ridge Observatory: 61 inch 155 cm: 1933–2005 [12]
It was not until the 20th century that really large reflectors would predominate once again. The major breakthrough in the 18th century was the perfection of two and even three lens refractor telescopes, as well as the increased number of reflectors using polished metal mirrors rather than metal-coated glass, which was not developed until the ...
The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
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