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Neutral Density Filter

Neutral density (ND) filters are used to attenuate incident radiation without altering its spectral distribution. The neutral density value of an ND filter is related to the transmittance by:
D=Log(1/T)
Optical Density: OD
Transmittance: T

 

Absorption glass Neutrol Density Filter

Specifications:
Material: Optical Neutral Density Glass
Flatness: 2l per 25 mm
Surface Quality: 80/50
Parallelism: 3'
Dimension: circle (dia.25.4mm typical) or square
Dimension Tolerance: +/-0.2mm
Optical Density Tolerance : ±5%

 

Metallic Coated Neutral Density Filter

Metallic coated ND filters are glass or quartz substrates with a precision metallic coating (Inconel) that provides uniform attenuation across a wide spectral range.

Specifications:
Material: BK7 glass and Fused Silica
Flatness: 2l per 25 mm
Surface Quality: 80/50
Parallelism: 3'
Dimension Tolerance: +/-0.2mm
Coating: Vacuum-deposited metallic alloy
Optical density Tolerance: +/-5%

Part No.

Dimension(mm)

Standard OD

NDF25

ø25.0

0.1, 0.2, 0.3, 0.4, 0.5, 0.8, 1.0, 2.0, 3.0

NDF50

50.0x50.0

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