4-meter mirror blank cast for the ELT project

In the next step, the mirror substrate will be transported back to the main plant. The workpiece will then be ground precisely into an extremely curved shape that comes close to the final geometry on a new CNC machining machine. The secondary mirror is scheduled for delivery in January 2019, in order to then continue its journey to near Paris for fine polishing at REOSC, the optical department of the SAFRAN Group.
