List of Largest Optical Reflecting Telescopes - Top Telescope 2000

Top Telescope 2000

Name Out In aperture (m) Area (m²) Mirrors Note Altitude
Keck 1 & 2 10 m each 76 m2 each 36 x 1.8 m hexagons M1 mirrors each largest twin telescopes, largest aperture mirrors, 152 m² total optical area 4145 m
Hobby-Eberly Telescope (HET) 9.2 (max.) 66–45 m² 92 x 1 m hexagon; 11 x 9.8 m mirror Spherical M1 w/ fixed mirror; spectroscopy 2030 m
Subaru Telescope 8.2 53 m² 1 x 8.3 m M1 Largest single piece mirror (tied with the 4 VLT) 4145 m
VLT 1,2,3, & 4 8.2 m each 53 m² each 1 x 8.2 m M1 Largest quadruplet telescope; largest single piece mirrors (tied with Subaru) 2635 m

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