DescriptionSpecifications
Models
Catalog PDF
Specifications
| Material | Optical grade germanium or equivalent |
| Coating | Vacuum deposited metal alloy |
| Diameter | 25.4 mm ±0.2 mm |
| Clear Aperture | All but 1.5 mm outer rim |
| Surface Quality | 80-50 scratch-dig |
| Thickness | 1mm ± 0.2 mm |
| Parallelism | 3 to 5 arc min (0.8 to 1.5 mrad) |
| Wavelength Range | 2 to 14 µm (optimized for 2 to 5 µm) |
Typical transmittance of IR ND Filters. The germanium substrate absorbs strongly below 1.8 µm.
| | Model | Description |
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FIR-ND03
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Infrared Neutral Density Filter, 25.4 mm Diameter, 0.3 OD, ±3% Tolerance
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FIR-ND06
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Infrared Neutral Density Filter, 25.4 mm Diameter, 0.6 OD, ±3% Tolerance
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FIR-ND10
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Infrared Neutral Density Filter, 25.4 mm Diameter, 1.0 OD, ±3% Tolerance
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FIR-ND20
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Infrared Neutral Density Filter, 25.4 mm Diameter, 2.0 OD, ±3% Tolerance
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FIR-ND30
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Infrared Neutral Density Filter, 25.4 mm Diameter, 3.0 OD, ±3% Tolerance
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FS-IR
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Infrared ND Filter Set, 25.4 Dia, Includes: 0.3, 0.6, 1.0, 2.0 & 3.0 OD Filters
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