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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.
m Aper. in Mirror type Nationality / Sponsors Site Built Large Binocular Telescope (LBT) 11.9 m (8.4 m×2) 330" × 2: Multiple mirror, 2: USA, Italy, Germany: Mount Graham International Obs., Arizona, USA: 2004 Hobby–Eberly Telescope (HET) (11 m × 9.8 m mirror) 10 m: 394" Segmented, 91: USA, Germany: McDonald Observatory, Texas, USA: 1997 ...
Overwhelmingly Large Telescope; Alternative names: OWL : Organization: European Southern Observatory Wavelength: 0.32 μm (940 THz)–12 μm (25 THz) Telescope style: Cassegrain reflecting telescope optical telescope Diameter: 60, 100 m (196 ft 10 in, 328 ft 1 in) Collecting area: 2,827, 7,854 m 2 (30,430, 84,540 sq ft) Focal length
Zooming in on a portion of the Euclid telescope's map 600 times reveals the galaxies within the cluster Abell 3381, located 470 million light-years away from Earth.
Telescopes of comparable or larger size have subsequently employed flexible or segmented mirrors, and the BTA-6 remained the world's largest rigid-mirror telescope until the advent of spin-casting technology (which produced, for example, the single 8.4-meter primary mirror of the Large Binocular Telescope in the late 1990s).
Unitron is a US-based company and distributor of optical instruments including stereo microscopes and accessories, binoculars, and classic brass telescopes. The company was founded in 1952 by Lawrence A. Fine as the United Trading Company and located in Boston, MA. [1]