File:The ELT M2 mirror in metrology (img-7432).jpg

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Captions

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At 4.25 metres across, the Extremely Large Telescope’s (ELT's) secondary mirror, M2, will be the largest optical secondary mirror ever used on a telescope.

Summary

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Description
English: At 4.25 metres across, the Extremely Large Telescope’s (ELT's) secondary mirror, M2, will be the largest optical secondary mirror ever used on a telescope. Here, the Safran Reosc team in France is measuring the accuracy of the M2’s surface; it needs to be accurate to a few nanometres, about 20 000 times thinner than a human hair.
Date 27 November 2023, 14:20:00 (upload date)
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This media was produced by the European Southern Observatory (ESO), under the identifier img-7432

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Author Safran
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