| Place of Origin |
Hubei China (Mainland) |
SpecificationsStandards Effective Focal Length (EFL) Tolerance: ±2% Dimensional Tolerances Diameter: +0.000'' -0.005'' Thickness: ±0.010'' Edge Thickness Variation (ETV) ±0.002'' Parallelism Plano: <3 arc minutes Surface Figure (power-irregularity) at 0.63 microns Plano: 1 fringe - 0.5 fringe Radiused: depending on radius Surface Quality: Scratch-Dig 60-40 AR Coating Reflectivity Per surface at 10.6 microns 0.25%