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2. File:Comparison optical telescope primary mirrors.svg

   en.wikipedia.org/wiki/File:Comparison_optical...

   Dotted lines show sizes of round mirrors that would have had equivalent light-gathering ability. The telescopes shown on this comparison chart are listed below, ordered in each sub-section by (effective) mirror/lens area, low to high, and then by actual/planned first light date, old to new. The "present-day" status is given as of the beginning ...

3. File:Primary Mirror Size Comparison Between Webb and Hubble ...

   en.wikipedia.org/wiki/File:Primary_Mirror_Size...

   Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221.; The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies.

4. List of largest optical reflecting telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   605 cm f/4 M1 mirror: Mirror replaced twice: 2070 1948–1976: Hale (200 inch) 5.1 – 508 cm f/3.3 M1 mirror: Art deco dome: 1713 1917–1948: Hooker (100 inch) 2.54 – Also used for 1st optical interferometer: 1742 For earlier entries, see List of largest optical telescopes historically

5. Segmented mirror - Wikipedia

   en.wikipedia.org/wiki/Segmented_mirror

   Segmented mirrors are typically hexagonal and arranged in a honeycomb pattern. A segmented mirror is an array of smaller mirrors designed to act as segments of a single large curved mirror. The segments can be either spherical or asymmetric (if they are part of a larger parabolic reflector [1]). They are used as objectives for large reflecting ...

6. Thirty Meter Telescope - Wikipedia

   en.wikipedia.org/wiki/Thirty_Meter_Telescope

   A 3.1-metre (10 ft) secondary mirror is to produce an unobstructed field-of-view of 20 arcminutes in diameter with a focal ratio of 15. A 3.5-by-2.5-meter (11.5 ft × 8.2 ft) flat tertiary mirror is to direct the light path to science instruments mounted on large Nasmyth platforms. [57] [58] The telescope is to have an alt-azimuth mount. [59]

7. Ritchey–Chrétien telescope - Wikipedia

   en.wikipedia.org/wiki/Ritchey–Chrétien_telescope

   Since then, advances in optical measurement [8] and fabrication [9] have allowed the RCT design to take over – the Hale telescope, dedicated in 1948, turned out to be the last world-leading telescope to have a parabolic primary mirror. [10] A 41 cm RC Optical Systems truss telescope, part of the PROMPT Telescopes array.