Nicholas U. Mayall Telescope
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| Organisation | NOAO |
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| Location(s) | Arizona, USA |
| Coordinates | 31°57′48″N 111°36′01″W / 31.9634°N 111.6003°WCoordinates: 31°57′48″N 111°36′01″W / 31.9634°N 111.6003°W |
| Altitude | 2,120 m (6,960 ft) |
| Wavelength | optical |
| Built | Completed 1973 |
| Telescope style | reflector |
| Collecting area | 11.4 m2 |
| Website | The Mayall 4-Meter Telescope |
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The Nicholas U. Mayall Telescope, also known as the Mayall 4-meter Telescope, is a four-meter reflector telescope located at the Kitt Peak National Observatory and named after Nicholas U. Mayall. It saw first light on February 27, 1973. Initial observers included: D. Crawford, Nicholas Mayall, and Arthur Hoag. It was dedicated on June 20, 1973 after Mayall's retirement as director. The mirror has an f/2.7 hyperboloidal shape. It is made from a two-foot (61 cm (24 in)) thick fused quartz disk that is supported in an advanced-design mirror cell. The prime focus has a field of view six times larger than that of the Hale reflector. An identical reflector was later built at Cerro Tololo Inter-American Observatory, in Chile.
The Mayall (4 m) debuted neatly between the Hale (5 m) and Shane (3 m) in the early 1970s.
Largest telescopes 1973:
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