ELT secondary mirror blank in the streets of Mainz

Transfer of ELT secondary mirror blank to the SCHOTT 4-metre blank annealing facility in Mainz, Germany in May 2017. The blank was cast out of ZERODUR®, a material originally developed for astronomical telescopes in the late 1960s. Zerodur® has almost no thermal expansion even when subjected to large temperature fluctuations, is highly chemically resistant, and can be polished to a high standard of finish.

Credit:

SCHOTT/ESO

About the Image

Id:eso1715e
Type:Photographic
Release date:22 May 2017, 12:00
Related releases:eso1715
Size:3282 x 5244 px

About the Object

Type:Unspecified : Technology
Category:ELT

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