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Materials optical glass/BK7/K9/UV fused silica/CaF2/ZnSeDimension 0.75-200mmDimensional Tolerance ±0.01mmAngle Tolerance ±3‘Surface Flatness 1/4LambdaEffective aperture >90%Surface Quality 60/40, 40/20 20/10 or betterBevel 0.1-0.3mmx45°We also produce optical lenses, cylindrical lenses,optical filters, optical windows, mirrors, prisms, ball and hemispherical lenses, cylindrical mirrors, dome covers, infrared lenses, laser lenses, optical crystals, etc. please contact us [email protected]