Specifications Linear Dimensions : ? 0.15 mm 90% Deviation Tolerance Standard series < 3 arc min. Precision series < 3 arc sec. Flatness over central 90% edge dimensions Standard Series - 2 l Precision Series - l/4 Reflectivity :> 80% per face from 400-800 nm Surface Quality: Mil-0-13830 Standard series :80-50 Precision series : 60-40 Pentagonal surfaces are fine ground All edges are ground |