4 ms·
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 htt
by gammarator 12y ago
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 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 http://www.astro.ubc.ca/LMT/lzt/index.html