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File:3 58 meter mirror for the New Technology Telescope (NTT) (eso8805a).tif

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Early July 1988, the 3.58 meter mirror for the New Technology Telescope (NTT) rests on its active support system during the final tests at the Carl Zeiss (Federal Republic of Germany) works in Oberkochen, FRG.

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Description
English: Early July 1988, the 3.58 meter mirror for the New Technology Telescope (NTT) rests on its active support system during the final tests at the Carl Zeiss (Federal Republic of Germany) works in Oberkochen, FRG. The 6-ton mirror blank is made of Zerodur, a glass ceramic, and was produced by Schott in Mainz, FRG. The polishing of the mirror by Zeiss has taken two years in order to obtain an unsurpassed optical quality. The exceedingly smooth surface has residual errors of no more than 25 nanometers (1 nanometer = 1 millionth of a millimeter).
Date 14 July 1988 (upload date)
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This media was produced by the European Southern Observatory (ESO), under the identifier eso8805a

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current18:38, 30 October 2023Thumbnail for version as of 18:38, 30 October 20231,305 × 1,734 (1.67 MB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of https://www.eso.org/public/archives/images/original/eso8805a.tif via Commons:Spacemedia

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