List of Largest Optical Reflecting Telescopes - Plans

Plans

Below are selected telescopes that are still in the conceptual/proposed stage or still under construction.

Under construction or planned construction

• European Extremely Large Telescope 39.3 m
• Thirty Meter Telescope 30 m
• Giant Magellan Telescope 7×8.4 m mirrors = 24.5 m aperture (21.4 m equivalent area)
• Large Synoptic Survey Telescope 8.4 m (2015 first light planned)
• James Webb Space Telescope 6.5 m (2018 launch planned)
• Automated Planet Finder 2.4 m (almost complete)
• Pan-STARRS 4 x 1.8 m (1 complete)
• Magdalena Ridge Observatory Telescope Array 10 x 1.4 m
• Thai National Telescope Project 2.4 m
• Advanced Technology Solar Telescope 4 m (see also list of solar telescopes)
• International Liquid Mirror Telescope 4 m
• HDRT 22m equiv.
• 3.6 m Devasthal Optical Telescope (2013 first light planned)

Proposed or planned

• ALPACA telescope, 8 m liquid mirror
• Advanced Technology Large-Aperture Space Telescope (ATLAST), 8-15m space telescope
• Chinese Future Giant Telescope (CFGT). Proposed optical telescope with a 30 meter diameter primary mirror.
• Chinese Giant Solar Telescope (CGST) China aim to build a very large infrared and optical solar telescope, with the spatial resolution expected to be equivalent to an 8m-diameter telescope and light-gathering power equivalent to a 5m-diameter full aperture telescope

Formerly proposed or planned

• Overwhelmingly Large Telescope 60–100 m study concluded
• Euro 50 50 m study concluded
• Large Atacama Telescope
• Hubble Origins Probe study concluded