Optical Filters Neutral Density Filters

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). 


Don’t limit what you see. Customization may be available for this product. Let us know your specifications in the RFQ form. You may also browse our manufacturing capabilities.

Product NamePart NumberDia (mm)ODThickness (mm) λ (nm)
Absorptive NDFNDF-FS-UV-A25.40.3-3.03.0250-700
Absorptive NDFNDF-SCH-VIS-A25.40.1-3.01.0/2.0/3.0400-700
Absorptive NDFNDF-FS-NIR-A25.40.3-3.01.5/3.0750-1100
Absorptive NDFNDF-BK-VIS-A25.40.1-3.01.0/2.0400-700
Reflective NDFNDF-FS-UV-R25.40.1-3.01.0/2.0250-700
Reflective NDFNDF-BK-VIS-R25.40.1-3.01.0/2.0400-700
Reflective NDFNDF-BK-NIR-R25.40.1-3.01.0/2.0750-1100

Glass Filters Neutral Density DiagramMaterial: 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


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