List of Largest Optical Reflecting Telescopes - Chronologically

Chronologically

Years Largest Name Out In aperture (m) Area (m²) M1 Mirror Note Altitude
2009–Present Gran Telescopio Canarias 10.4 m 74 m² 36 x 1.9 m hexagons M1 mirror Segmented mirror 2267 m
1993–2009 Keck 1 10 m 76 m2 36 x 1.8 m hexagons M1 mirror Segmented mirror, M1 f/1.75 4145 m
1976–1993 BTA-6 6 m 26 m² 605 cm f/4 M1 mirror Mirror replaced twice 2070 m
1948–1976 Hale (200 inch) 5.1 m m² 508 cm f/3.3 M1 mirror Art deco dome 1713 m
1917–1948 Hooker (100 inch) 2.54 m m² also used for 1st optical interferometer 1742 m

For earlier top telescopes see List of largest optical telescopes historically

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