With polished optics, JENOPTIK Optical Systems, Inc. manufactures to the tolerances listed in the chart below. In systems manufacture, component tolerances are held to the tightest degree necessary to ensure optical performance without adding unnecessary cost. For components, the cost implications of moving to a tighter tolerance category can mean multiples of the cost of the next lower grade.
Element Tolerances
| Tolerance of Optical Elements | Commercial | Standard | Precision |
| Index of refraction accuracy (nd) | 0.001 | 0.0005 | 0.0002 |
| Stress Birefringence | 10 nm/cm | 6 nm/cm | < 4 nm/cm |
| Stress Birefringence - Schott designation | N | NSK | NSSK |
| Stress Birefringence - ISO 10110 (code 0) | 0 / 10 | 0 / 6 | 0 / 4 |
| Dispersion accuracy - ISO 10110 | +/- 0.8% | +/- 0.5% | +/- 0.3% |
| Homogeneity of index | 0.0001 | 0.00002 | 0.000005 |
| Bubble quality | > 0.25 to 0.50 | > 0.10 to 0.25 | > 0.03 to 0.10 |
| (total bubble cross section in mm2 per 100cm3) | |||
| Bubble quality - Schott | B3 | B2 | B1 |
| Bubble quality - ISO 10110 (code 1) | 1 / 1 x 1.0 | 1 / 1 x 0.25 | 1 / 4 x 0.025 |
| Diameter (mm) | +0.00 / -0.10 | +0.00 / -0.05 | +0.00 / -0.025 |
| Center thickness (mm) | 0.15 | 0.1 | 0.05 |
| Sag (mm) | +/- 0.050 | +/- 0.025 | +/- 0.010 |
| Radius (%) | 0.40% | 0.20% | 0.10% |
| Surface figure saggita error | 3 | 2 | 1 |
| - (power in fringes at 546 nm)) | |||
| Surface figure irregularity | 2 fringes | 1 fringe | 0.5 fringe |
| - (fringes at 546 nm) | |||
| Surface figure - ISO 10110 (code 3) | 3 / 3 (2) | 3 / 2 (1) | 3 / 1 (0.5) |
| Surface imperfections (scratch-dig) | 80-50 | 60-40 | 40-10 |
| Lens Centering (R1-R2) | 0.05 mm TIR | 0.025 mm TIR | 0.01 mm TIR |
| ISO specification (code 4) | 4 / 2' | 4 / 1' | 4 / 0.5' |
| Bevels | 0.5 mm face width | 0.25 mm face width | 0.1 mm face width |
| Surface microroughness | |||
| Fused Silica | < 15 Angstroms rms | < 10 Angstroms rms | < 6 angstroms rms |
| Zerodur | < 15 Angstroms rms | < 10 Angstroms rms | < 8 angstroms rms |
| Optical glass | < 15 Angstroms rms | < 10 Angstroms rms | < 8 angstroms rms |
| ISO specification "Surface Texture" (Rq) | 0.0015 | 0.001 | .0006 / .0008 |
Assembly Tolerances
| Tolerance by Element diameter | 200 mm | 50 mm | 5 mm |
| Element decentration (mm) | 0.200 | 0.100 | 0.025 |
| Element tilt (arcminutes) | 0.5 arcminute | 1 arcminute | 2 arcminutes |
| Airspace tolerance (mm) | 0.20 mm | 0.10 mm | 0.05 mm |
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