Thursday, 25 May 2017

Secondary Mirror of ELT Successfully Cast: Largest convex mirror blank ever created

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The casting of the secondary mirror blank for ESO’s Extremely Large Telescope (ELT) has been completed by SCHOTT at Mainz, Germany. 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 a telescope and also the largest convex mirror ever produced.
via Science Daily
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