Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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Tolerance Chart
Materials: Ohara, Corning, Schott, Heraeus | Diameter Range: 8-150mm to 5-200mm Geometric Types: Aspheres, Spherical Lenses, Windows, Wedges, Prisms, Cylinders, & Freeforms
| Attribute | Standard | Precision | High Precision |
| Glass Material (nd , vd) | ±0.001, ±.8% | ±0.0005, ±.5% | Design for Melt |
| Diameter (mm) | ±0.1 | ±0.025 | ±0.015 |
| Center Thickness (mm) | ±0.1 | ±0.050 | ±0.025 |
| Sag (mm) | ±0.050 | ±0.025 | ±0.010 |
| Clear Aperture | 80% | 90% | 95% |
| Radius (larger of two) | ±0.2% or 5 fr | ±0.1% or 3 fr | ±0.025 or 1 fr |
| Irregularity-Interferometer (waves, PV) | 1 | 0.5 | 0.1 |
| Irregularity- Profilometer (microns, PV) | ±1 | ±0.5 | ±0.1 |
| Wedge Lens (ETD, mm) | 0.050 | 0.010 | 0.005 |
| Scratch Dig | 60-40 to 80-50 | 40-20 | 10-5 to 20-10 |
| Surface Roughness (? RMS) | 50 | 20 | 10 |
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