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Neutral Density Filter

Neutral density filters are light filters that decrease the intensity of light without altering the relative spectral distribution of the energy. They are used to filter the entire visible spectrum evenly, allowing light reduction, without influencing color or contrast. For this reason, neutral density filters are often referred to as gray filters, or ND filters. Attenuation is accomplished by using either a light-absorbing glass or a thin-film metal coating that combines absorption and reflection. Metallic type neutral density filters obtain their optical density by depositing a metal alloy coating onto a specific type of substrate, which is determined by the wavelength region of interest. They are slightly sensitive to angles but they are much more forgiving than interference filters. Neutral density (ND) filters attenuate spectral regions selected from 250 to 2500 nm. The level of attenuation can be specified from optical density 0.04 to 5.0.

Principle: Optical Density: OD, Transmittance: T, so OD=Log(1/T).


Neutral Density Glass Type

Specifications:
Material Optical Neutral Density Glass
Diameter Tolerance +0.0/-0.2mm
Thickness Tolerance
0.1mm
Clear Aperture >Central 85% of diameter
Surface Quality 60-40 S/D

Parallelism

< 3 arc minute

Flatness

2 per 25mm @632.8nm

Optical Density
OD(avg) 5%(avg) @400-700nm
Protective Bevel <0.25mm x 45

Neutral Density Glass Type Neutral Density Filter Standard Products:
Optical Density
OD(avg)
Transmission (%)
T(avg)
Thickness (mm) Appr.

20.0

25.4

Part No.
Part No.
0.1
79.4
1.35
FNG1010
FNG2010
0.2
63.1
3.44
FNG1020
FNG2020
0.3
50.1
2.40
FNG1030
FNG2030
0.4
39.8
3.31
FNG1040
FNG2040
0.5
31.6
1.84
FNG1050
FNG2050
0.8
15.8
3.03
FNG1080
FNG2080
1.0
10
2.05
FNG1100
FNG2100
2.0
1
4.19
FNG1200
FNG2200
3.0
0.1
1.50
FNG1300
FNG2300
4.0
0.01
2.22
FNG1400
FNG2400
Note: Neutral density coating type neutral density filter are available upon your request.

The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics ranging in size from 1-200mm. The manufacturing limits are not absolute; tighter tolerances may be possible. Part specific tolerances may vary depending on component size, shape, and/or material.

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