Largest Optical Telescopes

Largest Optical Telescopes of Today & Tomorrow
Name and locationPrimary-mirror aperture (meters)
European Extremely Large Telescope (proposed)42
Thirty Meter Telescope (proposed)30
Giant Magellan Telescope (proposed)
Cerro Las Campanas, Chile
24.5
Gran Telescopio Canarias (GTC)
La Palma, Canary Islands
10.4
Keck Telescopes
Mauna Kea, Hawaii
10.0 (×2)
Southern African Large Telescope (SALT)
Sutherland, South Africa
9.2
Hobby-Eberly Telescope (HET)
Mount Fowlkes, Texas
9.2
Large Binocular Telescope (LBT)
Mount Graham, Arizona
8.4 (×2)
Large Synoptic Survey Telescope (LSST)
Cerro Pachón, Chile
8.4
Subaru Telescope, Mauna Kea, Hawaii8.2
Very Large Telescope, Cerro Paranal, Chile8.2 (×4)
Frederick C. Gillett Gemini North Telescope
Mauna Kea, Hawaii
8.1
Gemini South Telescope, Cerro Pachón, Chile8.1
MMT Observatory, Mount Hopkins, Arizona6.5
Walter Baade and Landon Clay Telescopes (Magellan), Cerro Las Campanas, Chile6.5 (×2)
Bolshoi Teleskop Azimultal'ny
Mount Pastukhova, Russia
6.0
Large Zenith Telescope ( (liquid mirror)
Maple Ridge, British Columbia
6.0
Hale Telescope, Palomar Mountain, California5.0

Italics denote facilities under construction or in development.

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