Neutral Density Filters
Neutral density filters can be absorptive or reflective. These filters evenly attenuate the transmission across a certain spectrum by absorbing or reflecting non-transmitted light. Hence, they are used in imaging applications to prevent damage or inaccuracy from excessive light for instance in-camera, photometer, and light control applications. These filters are available with us in UV, Visible, NIR, and IR spectral regions and in a range of optical densities (0.1–3).
| Product Name | Part Number | Dia (mm) | OD | Thickness (mm) | λ (nm) |
|---|---|---|---|---|---|
| Absorptive NDF | NDF-FS-UV-A | 25.4 | 0.3-3.0 | 3.0 | 250-700 |
| Absorptive NDF | NDF-SCH-VIS-A | 25.4 | 0.1-3.0 | 1.0/2.0/3.0 | 400-700 |
| Absorptive NDF | NDF-FS-NIR-A | 25.4 | 0.3-3.0 | 1.5/3.0 | 750-1100 |
| Absorptive NDF | NDF-BK-VIS-A | 25.4 | 0.1-3.0 | 1.0/2.0 | 400-700 |
| Reflective NDF | NDF-FS-UV-R | 25.4 | 0.1-3.0 | 1.0/2.0 | 250-700 |
| Reflective NDF | NDF-BK-VIS-R | 25.4 | 0.1-3.0 | 1.0/2.0 | 400-700 |
| Reflective NDF | NDF-BK-NIR-R | 25.4 | 0.1-3.0 | 1.0/2.0 | 750-1100 |
Neutral Density Filters Information
Material: Schott glass, N-BK7, FS
Dimension Tolerance: +0.0/-0.2mm
Surface Quality: 60/40
Clear Aperture: >90%
Flatness: <2λ@632.8nm
Parallelism: <5 arc minutes
Chamfer: Protective<0.5mmx45°
OD Tolerance: OD±10%@Design Wavelength
