Material:BK7 or(JGS1 JGS2 JGS3) Glass Qualityz:nd+/-0.001~+/-0.0001 vd +/-0.8%~+/-0.1% Dimension Tolerance:+/-0.20mm~+0.01/-0.01mm Thickness Tolerance:+/-0.20mm~+/-0.005mm Surface Quality:80-50~10-5 Surface Flatness: at 632.8nm lambda~ lambda /20 per 25mm Clear Aperture 80% ~100% Angle Tolerance 3-5 minutes~3 second Chamfer 0.3+/-0.20mm x45degree No Chamfer Coating Optional
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