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Message: <blockquote data-quote="etudiant" data-source="post: 3161351" data-attributes="member: 48052">A great site for optics in astronomy is by the European Southern Observatory.<a href="http://www.eso.org/public/" target="_blank">http://www.eso.org/public/</a>They have superb videos that delve into the design of their telescopes and lots of good links.The Keck twin telescopes in Hawaii, which are the first ground based large segmented mirror telescopes offer another superb site.<a href="http://www.keckobservatory.org/" target="_blank">http://www.keckobservatory.org/</a>One can really get into the technology involved. These giant scopes are the cathedrals of our day.</blockquote>