Primary Mirror Blanks Qualified and Accepted by TMT

April 24, 2017 Pasadena, CA – The TMT project has accepted 72 mirror blanks produced by OHARA, a Japanese optical glass manufacturer in Sagamihara near Tokyo, and polished by CANON Inc., under the direction of the National Astronomical Observatory of Japan (NAOJ). This official acceptance confirms the excellent quality of the blanks and is based on stringent verification of the technical specifications set for all 492 TMT primary segment blanks (plus an additional 82 spare units) that will ultimately make TMT’s 30-meter diameter primary mirror.

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