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The GTC began its preliminary observations on 13 July 2007, using 12 segments of its primary mirror, made of Zerodur glass-ceramic by the German company Schott AG.
Mirror support cell which supports the primary mirror in a reflecting telescope
Due to a miscalibrated null corrector, the primary mirror was also found to have a significant spherical aberration after reaching orbit on STS-31.
The Southern African Large Telescope (SALT) selected Sitall for the manufacture of its 91 primary mirror segments by Lytkarino Optical Glass Factory (LZOS).