نموذج: ND4 ND8
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| Parameter | ND4 Filter Glass | ND8 Filter Glass |
| Optical Density | 0.6 ±0.05 | 0.9 ±0.05 |
| Stop Reduction | 2 f-stops | 3 f-stops |
| Transmission | 25% ±2% | 12.5% ±2% |
| Wavelength Range | 400–700nm (visible) | 400–700nm (visible) |
| Surface Quality | 60/40 scratch/dig (or better) | 60/40 scratch/dig (or better) |
| Parallelism | ≤3 arc minutes | ≤3 arc minutes |
| Flatness | ≤λ/4 @ 632.8nm | ≤λ/4 @ 632.8nm |
| Substrate | Schott/B270, fused silica, or equivalent optical glass | Schott/B270, fused silica, or equivalent optical glass |
| Coating (optional) | MgF₂ or Broadband AR (R<0.5%) | MgF₂ or Broadband AR (R<0.5%) |
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.
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