The casting of the secondary mirror blank for the ESO Extremely Large Telescope (ELT) was completed by SCHOTT at Mainz, Germany on 11 May 2017. The completed mirror will be 4.2 metres in diameter and weigh 3.5 tonnes. It will be the largest secondary mirror ever employed on an optical telescope and also the largest convex mirror ever produced. See the Release for more details.
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Secondary Mirror of ELT Successfully Cast
Published: 13 Jun 2017
