Neutral Density Filter

Short Description:

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

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Product Detail

Product Tags

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
Optical Density	Transmission (%)	Thickness (mm) Appr.	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