| Name | Image | Effective opening
m | Aper.
inches | Type of mirror | Nationality / Sponsorship | Place | Ina year.
|
|---|
| Gran Telescopio Canarias (GTC) |  | & fake fake fake fake fake fake fake fake fake fake fake fake brainstorm 010,40000010.4 m | 409′′′ | Segmented, 36 |  Spain Mexico
 USA
| Roque de los Muchachos Obs., Canary Islands, Spain | 2006/9 |
Hobby-Eberly Telescope (HET)
11 m × 9.8 m mirror |  | ' s fake fake fake fake fake fake fake brainchild.10 m | 394′′ | Segmented, 91 | USA  Germany
| McDonald Observatory, Texas, USA | 1997 |
| Keck 1 |  | ' s fake fake fake fake fake fake fake brainchild.10 m | 394′′ | Segmented, 36 | USA | Mauna Kea Observatories, Hawaii, USA | 1993 |
| Keck 2 | | ' s fake fake fake fake fake fake fake brainchild.10 m | 394′′ | Segmented, 36 | USA | Mauna Kea Observatories, Hawaii, USA | 1996 |
Southern African Large Telescope (SALT)
11 m × 9.8 m mirror |  | & fake fake fake fake fake fake fake fake fake fake fake brainchild.9,2 m | 362′′′ | Segmented, 91 |  South Africa[[United KingdomITY]] USA Germany  United Kingdom
 Poland
 New Zealand
| South African Astronomical Obs., Northern Cape, South Africa | 2005 |
Large Binocular Telescope (LBT)
Phased-array optics for combined 11.9 m |  | ' s fake fake fake fake fake fake fake fake fake brainchild fake 08,4000008.4 m × 2 | 330′′ × 2 | Multiple mirror, 2 | [[United KingdomITY]] USA  Italy
Germany | Mount Graham International Observatory, Arizona, USA | 2004 |
| Subaru (JNLT) |  | ' s fake fake fake fake fake fake fake fake fake brainchild fake 08,2000008.2 m | 323′′′ | Single |  Japan | Mauna Kea Observatories, Hawaii, USA | 1999 |
| VLT UT1 - Antu |  | ' s fake fake fake fake fake fake fake fake fake brainchild fake 08,2000008.2 m | 323′′′ | Single | Europe  Chile
| Paranal Observatory, Antofagasta Region, Chile | 1998 |
| VLT UT2 – Kueyen |  | ' s fake fake fake fake fake fake fake fake fake brainchild fake 08,2000008.2 m | 323′′′ | Single | Europe Chile | Paranal Observatory, Antofagasta Region, Chile | 1999 |
| VLT UT3 - Melipal |  | ' s fake fake fake fake fake fake fake fake fake brainchild fake 08,2000008.2 m | 323′′′ | Single | Europe Chile | Paranal Observatory, Antofagasta Region, Chile | 2000 |
| VLT UT4 - Yepun |  | ' s fake fake fake fake fake fake fake fake fake brainchild fake 08,2000008.2 m | 323′′′ | Single | Europe Chile | Paranal Observatory, Antofagasta Region, Chile | 2001 |
| Gemini North (Gillett) |  | & fake fake fake fake fake fake fake fake brainchild fake 08,1000008.1 m | 318′′ | Single | USA  Canada
Chile United Kingdom  Australia
 Argentina
 Brazil
| Mauna Kea Observatories, Hawaii, USA | 1999 |
| Gemini South |  | & fake fake fake fake fake fake fake fake brainchild fake 08,1000008.1 m | 318′′ | Single | USA Canada
Chile United Kingdom Australia Argentina Brazil | Cerro Pachón (CTIO), Coquimbo Region, Chile | 2001 |
| MMT (1 x 6.5 m) |  | & fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild 06,5000006.5 m | 256′′ | Single | USA | F. L. Whipple Obs., Arizona, USA | 2000 |
| Magellan 1 (Walter Baade) |  | & fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild 06,5000006.5 m | 256′′ | Honeycomb | USA | Las Campanas Obs., Coquimbo Region, Chile | 2000 |
| Magellan 2 (Landon Clay) | | & fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild 06,5000006.5 m | 256′′ | Honeycomb | USA | Las Campanas Obs., Coquimbo Region, Chile | 2002 |
| BTA-6 |  | & fake fake fake fake fake fake brainchild fake fake brainchild.6 m | 238′′′ | Single |  Russia USSR
日本語Special Astrophysical Obs., Karachay–Cherkessia, Russia日本語1975
|
| Large Zenith Telescope (LZT) | | & fake fake fake fake fake fake brainchild fake fake brainchild.6 m | 236′′ | Liquid | Canada  France
USA | Maple Ridge, British Columbia, Canada | 2003 |
| Hale Telescope (200 inch) |  | ' s fake fake fake fake fake fake fake brainchild. fake 800005,08 m | 200′′ | Single | USA | Palomar Observatory, California, USA | 1948 |
| LAMOST “0000000000000004.900000 (6.67 m × 6.05 m + 5.72 m × 4.40 m correctr; effective aperture 3.6–4.9 m) |  | 4.9 m-3.6 m | 193′′ | Segmented
(37 + 24) |  China | Beijing Astronomical Obs., Xinglong, China | 2008 |
MMT (original optics: 6 × 1.8 m)
→see above record for current 6.5 m mirror | | & fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild.4.7 m
(6×1.8 m) | 186′′ | Segmented, 6 | USA | F. L. Whipple Obs., Arizona, USA | 1979–1998 |
| Discovery Channel Telescope |  | & fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild.4.3 m | 169′′ | Single | USA | Lowell Observatory, Happy Jack, Arizona, USA | 2012 |
| William Herschel Telescope |  | ' s fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild.4.2 m | 165′′ | Single | United Kingdom  Netherlands
Spain | Roque de los Muchachos Obs., Canary Islands, Spain | 1987 |
| SOAR | | & fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake brainstorm.4.1 m | 161′′′ | Single | USA Brazil | Cerro Pachón (CTIO), Coquimbo Región, Chile | 2002 |
| VISTA |  | & fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake brainstorm.4.1 m | 161′′′ | Single | Europe Chile | Paranal Observatory, Antofagasta Region, Chile | 2009 |
| Victor M. Blanco Telescope |  | ' s fake fake fake fake fake fake brainchild fake brainchild.4 m | 157′′ | Single | USA | Cerro Tololo Inter-American Obs., Coquimbo Region, Chile | 1976 |
| Nicholas U. Mayall 4 m |  | ' s fake fake fake fake fake fake brainchild fake brainchild.4 m | 158′′ | Single | USA | Kitt Peak National Obs., Arizona, USA | 1973 |
| Anglo-Australian Telescope (AAT) |  | " fake fake fake fake fake fake fake fake fake fake fake brainchild fake 03.8900003,89 m | 154′′ | Single | Australia United Kingdom | Australian Astronomical Obs., New South Wales, Australia | 1974 |
| 3.67 m AEOS Telescope (AEOS) |  | " fake fake fake fake fake fake fake fake fake fake fake fake fake fake brainchild fake fake fake brainchild fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake brain fake fake fake fake fake fake fake fake fake fake fake fake brain fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake3,67 m | 145′′ | Single | USA | Air Force Maui Optical Station, Hawaii, USA | 1996 |
| 3.6 m Devasthal Optical Telescope (DOT) |  | " fake fake fake fake fake fake fake fake fake fake fake brainchild fake 03,6000003,60 m | 141′′′ | Single |  India | ARIES Devasthal Observatory, Nainital, India | 2016 |
| Telescopio Nazionale Galileo (TNG) |  | " fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake3,58 m | 138′′ | Single | Italy | Roque de los Muchachos Obs., Canary Islands, Spain | 1997 |
| New Technology Telescope (NTT) |  | " fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake3,58 m | 142′′′′ | Single | Europe | La Silla Observatory, Coquimbo Region, Chile | 1989 |
| Canada-France-Hawaii Telescope (CFHT) |  | " fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake3,58 m | 141′′′ | Single | Canada France USA | Mauna Kea Observatories, Hawaii, USA | 1979 |
| ESO 3.6 m Telescope |  | " fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake fake3,57 m | 140′′′ | Single | Europe | La Silla Observatory, Coquimbo Región, Chile | 1977 |
| MPI-CAHA " fake fake fake fake fake fake fake fake fake fake brainchild fake 03,5000003.5 m |  | 3.5 m | 138′′ | Single | Spain  East Germany
| Calar Alto Obs., Almería, Spain | 1984 |
| USAF Starfire 3.5 m |  | " fake fake fake fake fake fake fake fake fake fake brainchild fake 03,5000003.5 m | 138′′ | Single | USA | Starfire Optical Range, New Mexico, USA | 1994 |
| WIYN Telescope |  | " fake fake fake fake fake fake fake fake fake fake brainchild fake 03,5000003.5 m | 138′′ | Single | USA | Kitt Peak National Obs., Arizona, USA | 1994 |
| Space Surveillance Telescope |  | " fake fake fake fake fake fake fake fake fake fake brainchild fake 03,5000003.5 m | 138′′ | Single | USA | White Sands Missile Range, New Mexico, USA | 2011 |
| Astrophysical Research Consortium (ARC) |  | " fake fake fake fake fake fake fake fake fake fake fake brainchild fake 03,4800003,48 m | 137′′′ | Single | USA | Apache Point Obs., New Mexico, USA | 1994 |
| Shane Telescope |  | ' s fake fake fake fake fake fake fake fake brainchild. fake500003,05 m | 120′′′ | Single | USA | Lick Observatory, California, USA | 1959 |
| NASA Infrared Telescope Facility |  | 3.0 m | 120′′′ | Single | USA | Mauna Kea Observatory, Hawaii, USA | 1979 |
NASA-LMT
→retired, private |  | & fake fake fake fake fake fake fake brainchild fake brainchild.3 m | 118′′ | Liquid | USA | NASA Orbital Debris Obs., New Mexico, USA | 1995–2002 |
|
Spain
USA
South Africa
Japan
Russia
Canada
China
.svg){kind=small}
United Kingdom
.svg){kind=small}
Australia
India
Italy
.svg){kind=small}
