| Specification |
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Material: BK7 Grade A optical glass |
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Dimension Tolerance: ±0.2mm |
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90° Deviation Tolerance |
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Standard series: < 30 arc seconds |
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Precision series: <5 arc seconds |
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Flatness: λ/4 at 632.8 nm |
| Reflectivity: R > 95% per face from 630 to 680 nm |
| Surface Quality: 60-40 scratch and dig |
