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ELT secondary mirror during transport to annealing facility
The ELT secondary mirror blank, cast out of ZERODUR®, arrives at the SCHOTT 4-metre blank annealing facility in Mainz, Germany in May 2017. Here, it will go through a slow cool-down, machining and heat treatment sequence over the next year. It will then be ready to be ground to precisely the right shape and polished.
Oikeudet:SCHOTT/ESO
