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Neutral Density Filters

Neutral Density (ND) Filters

Reflective ND filters provide a linear spectral transmission across the visible region. They control light intensity without selectively absorbing energies at specific wavelengths. They are, therefore, generally used to attenuate the intensity of a beam of light over a broad spectral region. This property is often required to prevent saturation or damage to a wide variety of detectors and even the human eye.

They are available in optical density of 0.3, 0.5, 0.6, 0.9, 1.0, 1.3, 1.5, 2.0, 2.5 and 3.0. Stack several ND filters together, and the total density is the sum of the density of each filter in the stack, permitting the creation of neutral density filters with custom optical densities.

Product SKUs

Thickness (mm)		Coating	Inconel
Transmission (min)	50.00%	Reflection	21.00%
Optical Density	0.3 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	12.5 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	50.00%	Reflection	21.00%
Optical Density	0.3 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	25.0 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	50.00%	Reflection	21.00%
Optical Density	0.3 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	50 mm Sq.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	32.00%	Reflection	30.00%
Optical Density	0.5 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	12.5 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	32.00%	Reflection	30.00%
Optical Density	0.5 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	25.0 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	32.00%	Reflection	30.00%
Optical Density	0.5 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	50 mm Sq.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	25.00%	Reflection	37.00%
Optical Density	0.6 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	12.5 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	25.00%	Reflection	37.00%
Optical Density	0.6 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	25.0 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	25.00%	Reflection	37.00%
Optical Density	0.6 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	50 mm Sq.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Thickness (mm)		Coating	Inconel
Transmission (min)	12.50%	Reflection	50.00%
Optical Density	0.9 OD	Density Tolerance	± 5% of density
Operating Range	400-700 nm	Substrate	Float Glass
Size (mm)	12.5 mm dia.	Clear Aperture	80%
Size Tolerance	± 0.5 mm	Parallelism	≤ 3 arc min.
Thickness (mm)	1.5 mm nominal	Scratch/Dig	80/50

Neutral Density Filters

EMF

Neutral Density (ND) Filters

Product SKUs

Neutral Density Filter, 0.3 OD, 12.5 mm Dia.

Neutral Density Filter, 0.3 OD, 25 mm Dia.

Neutral Density Filter, 0.3 OD, 50 mm Sq.

Neutral Density Filter, 0.5 OD, 12.5 mm Dia.

Neutral Density Filter, 0.5 OD, 25 mm Dia.

Neutral Density Filter, 0.5 OD, 50 mm Sq.

Neutral Density Filter, 0.6 OD, 12.5 mm Dia.

Neutral Density Filter, 0.6 OD, 25 mm Dia.

Neutral Density Filter, 0.6 OD, 50 mm Sq.

Neutral Density Filter, 0.9 OD, 12.5 mm Dia.

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