-Diameter: 1.023 meters/3.36 feet

-Central Hole Diameter: 0.168 meters/6.6 inches (hole enhances IR performance)

-Optical Surface: Convex, hyperboloid

-Mass/Weight: 45 kg/99.2 lbs (Honeycomb lightweighted by 85%)

-Material: Schott Zerodur glass-ceramic

-Polished By: Zeiss Optical, Germany

-Surface Accuracy: 17nm RMS (assuming compensating figure matching by primary

active optics)