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Neutral Density Filter
Neutral Density Filter reduces the brightness of an image without changing the color of the scene. It allows all wavelengths to pass through equally. Neutral density filters are categorized by their optical density (D) which is defined as the logarithm to the base 10 of the reciprocal of the transmittance (T): T=10-D

 Neutral Density Filter reduces the brightness of an image without changing the color of the scene. It allows all wavelengths to pass through equally. Neutral density filters are categorized by their optical density (D) which is defined as the logarithm to the base 10 of the reciprocal of the transmittance (T): T=10-D  

 

 

Specification:

 

Material

Optical Neutral Density Glass

Diameter Tolerance

+0.0, -0.2 mm

Thickness Tolerance

±0.1 mm

Surface Quality

60-40 scratch and dig

Clear Aperture

>85%

Parallelism

< 3 arc minute

Flatness

2λ per 25 mm @632.8 nm

Optical Density Tolerance

±5% @400-700 nm

Protective Bevel

<0.25 mm x 45°

 

Neutral Density Glass Type Filter Standard Products:

Optical Density

Transmission (%)

Thickness (mm) Appr.

φ20.0

φ25.4

Part No.

Part No.

0.1

79.4

1.35

TNF101

TNF201

0.2

63.1

3.44

TNF102

TNF202

0.3

50.1

2.4

TNF103

TNF203

0.4

39.8

3.31

TNF104

TNF204

0.5

31.6

1.84

TNF105

TNF205

0.8

15.8

3.03

TNF106

TNF206

Note: Neutral density coating type filter are available upon your request.

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