Absorptive Neutral Density Filters

With their ability to minimize back-reflections and scattered light, absorptive neutral density (ND) filters are ideal for calibration. In contrast to the metallic type, absorption-type filters achieve their optical density by absorbing light within the substrate. For this reason, thickness is a key determinant of opacity. Because of their absorbing quality, these filters are suitable for low-power applications only.

Features
Sets provide a uniform series of filters for adjusting illumination
Custom substrate materials and dimensions available
General Specifications
Thickness5.0 mm (maximum)
Dimensional Tolerance±0.5 mm
Clear Aperature90% of outside dimension
Surface Quality60/40 per MIL-0-13830B
Max. Operating Temperature+100 °C
Substrate MaterialSchott absorption glass
Spectral Range400-700 nm
Optical QualityFlatness of λ/4 per inch and parallelism of 30 arc seconds or better
Mechanical Unmounted
OptionalMounted in threaded ring - ask our expert on the right for thread sizes
Optical DensityNominal Transmission (%)Transmission @ 550 nm (%)Thickness (mm)Part Number
0.10
0.20
0.30
79.5
63.0
50.0
±20.00
±10.00
±10.00
4.50
1.67
2.84
010ABND
020ABND
030ABND
0.40
0.50
0.60
39.8
31.6
25.0
±10.00
±10.00
±10.00
3.78
2.11
2.54
040ABND
050ABND
060ABND
0.70
0.80
0.90
20.0
15.8
12.6
±10.00
±10.00
±10.00
2.95
3.38
1.75
070ABND
080ABND
090ABND
1.00
1.50
2.00
10.0
3.2
1.0
±10.00
±10.00
±10.00
1.96
2.90
2.06
100ABND
150ABND
200ABND
3.00
4.00
0.10
0.01
±10.00
±10.00
2.92
2.82
300ABND
400ABND

 Available as 25 mm Ø and 50 mm SQ

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Photography
Scientific Measurements and Research

Contacts

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