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Neutral Density Filters

issue date:2016-3-31 15:35:44 visit frequency:2180

Neutral Density Filters

Neutral Density (ND) Filters are designed to reduce transmission evenly across a portion of the spectrum by absorbing or reflecting the portion of the light that is not being transmitted. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission. ND Filters are often used in imaging or laser applications where excessive light can be damaging to camera sensors or other optical components. ND Filters are also ideal for preventing excessive light from causing inaccurate results in photometer applications.


Typical Characteristics

Substrate

ND Filter Glass

Diameter

25.0mm

Dimensional Tolerance

±0.1mm

Thickness

1.20mm

Thickness Tolerance

±0.1mm

Surface Quality

60-40

Design Wavelength(DWL)

400-700nm

Optical Density(OD)

0.10

Optical Density Tolerance

±5%

Transmission

>80%

Transmission Tolerance

±5%

Surface Accuracy

<λ/2@632.8nm

Parallelism

<3′

RoHS

Compliant

Neutral Density Filter reduces the brightness of an image without changing the color of the scene. It allows all wavelengths to pass through equally. OD=Log(1/T)

OD

T%

OD

T%

0.10

79%

0.15

70%

0.20

63%

0.30

50%

0.40

40%

0.50

32%

0.60

25%

0.70

20%

0.90

12.5%

1.00

10%

1.30

5%

1.50

3.2%

2.00

1.0%

2.50

0.3%

3.00

0.1%

4.00

0.01%

5.00

0.001%

6.00

0.0001%

Part No

Thickness

T%

Tolerance

NDF-02

2mm

2.0%

0.5 ~ 3.0%

NDF-05

2mm

5.0%

1.0 ~ 9.0%

NDF-10

2mm

10.0%

6.0 ~ 15.0%

NDF-25

2mm

25.0%

18.0 ~ 32.0%

NDF-30

2mm

30.0%

23.0 ~ 37.0%

NDF-50

2mm

50.0%

41.0 ~ 59.0%

NDF-65

2mm

65.0%

58.0 ~ 72.0%

NDF-70

2mm

70.0%

63.0 ~ 77.0%

Custom size available