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 |
Read more about this topic: List Of Largest Optical Reflecting Telescopes
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