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A comment on The Billion-Dollar Telescope Race. Parent comment

Re:The Billion-Dollar Telescope Race by gammarator on Wednesday September 03, 2014 @01:44AM (#8261667)
The Hobby-Eberly and SALT telescopes have (slightly) non-round mirrors that operate at fixed altitude: http://www.as.utexas.edu/mcdonald/het/het_gen_01.html

You might also find the Large Zenith Telescope interesting: it has a spinning liquid mirror! http://www.astro.ubc.ca/LMT/lzt/index.html

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