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ND Filter, 1.5 OD, 50 mm Sq.
ND Filter Specifications | ND-VIS-1.5-50
Optical Density
1.5 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 2.0 OD, 12.5 mm Dia.
ND Filter Specifications | ND-VIS-2.0-12.5
Optical Density
2.0 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 2.0 OD, 25 mm Dia.
ND Filter Specifications | ND-VIS-2.0-25
Optical Density
2.0 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 2.0 OD, 50 mm Sq.
ND Filter Specifications | ND-VIS-2.0-50
Optical Density
2.0 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 2.5 OD, 12.5 mm Dia.
ND Filter Specifications | ND-VIS-2.5-12.5
Optical Density
2.5 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 2.5 OD, 25 mm Dia.
ND Filter Specifications | ND-VIS-2.5-25
Optical Density
2.5 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 2.5 OD, 50 mm Sq.
ND Filter Specifications | ND-VIS-2.5-50
Optical Density
2.5 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 3.0 OD, 12.5 mm Dia.
ND Filter Specifications | ND-VIS-3.0-12.5
Optical Density
3.0 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 3.0 OD, 25 mm Dia.
ND Filter Specifications | ND-VIS-3.0-25
Optical Density
3.0 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
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ND Filter, 3.0 OD, 50 mm Sq.
ND Filter Specifications | ND-VIS-3.0-50
Optical Density
3.0 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
1.5 mm nominal
Scratch/Dig
80/50
Reflection
55.00%
Optical Coating
Inconel
Neutral Density Filters
EMF
Neutral Density Filters
Reflective Neutral Density Filters (ND Filters) provide a linear spectral transmission across the visible region. Reflective Neutral Density Filters 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.
Reflective ND Filters are available in standard densities of 0.3, 0.5, 0.6, 0.9, 1.0, 1.3, 1.5, 2.0, 2.5 and 3.0. Stack them, and the total density is the sum of the density of each filter in the stack, permitting the creation of intermediate neutral density values.