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Lab Quality: Materail:BK7 grade A optical glass Focal Length:+-2% Diameter Tolerance:+-0.1mm Center Thickness(Tc):+-0.1mm Centration:3arc minutes Fringes:1-5 Irregularity of Fringes:0.5-1 Surface Quality:60-40 scratch-dig Clear Aperture:90% Bevel:0.25mm*45 Coating:none LAB Quality List and Code No: >>>>>> |
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Quality: >>>>>> Materail:BK7 grade A optical glass Focal Length:+-1% Diameter Tolerance:+0.0,-0.1mm Center Thickness(Tc):+-0.1mm Centration:2arc minutes Fringes:1-5 Irregularity of Fringes:0.5-1 Surface Quality:40-20 scratch-dig Clear Aperture:90% Bevel:0.25mm*45 Coating:none Research List and Code No >>>>>> |
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