ELT M1 segments take shape at Safran Reosc polishing facilities

Primary mirror, M1, segments of ESO’s Extremely Large Telescope (ELT) awaiting finishing at Safran Reosc facilities in France. 798 hexagonal segments will work together on the ELT, acting as one giant mirror 39-metres across. To meet the challenge of delivering such a large number of polished segments along with 133 spares within seven years, Safran Reosc has to build up to a peak production rate of five mirrors a week.