Product added to cart

SCHOTT NG3, 25mm Dia., 2mm Thick, Absorptive ND Filter

See More by SCHOTT Optical Components
SCHOTT NG Gray Glass Neutral Density (ND) Filters

SCHOTT NG Gray Glass Neutral Density (ND) Filters

SCHOTT NG Gray Glass Neutral Density (ND) Filters SCHOTT NG Gray Glass Neutral Density (ND) Filters
Stock #14-083 In Stock
Quantity Selector - Use the plus and minus buttons to adjust the quantity. +
Qty 1-10
Qty 11+
Volume Pricing
Request Quote
Prices shown are exclusive of VAT/local taxes
Get Product Downloads
Diameter (mm):
Optical Density OD (Average):
Glass/Filter Number:
Index of Refraction nd:
Surface Quality:
Transformation Temperature (°C):
Thickness (mm):
2.00 ±0.2
Transmission (%):
Transmission Tolerance (%):
Neutral Density Filter
Parallelism (arcmin):
Dimensional Tolerance (mm):
Optical Density Tolerance (%):

Regulatory Compliance

Reach 224:
Certificate of Conformance:

Product Family Description

  • Tightly Controlled Thickness Specifications
  • Standard Thicknesses of 1, 2, and 3mm
  • Even Light Attenuation in the Visible Spectrum
  • NG1, NG3, NG4, NG5, NG9 and NG11 Glass Types Available
  • Precision SCHOTT NG Glass Filters Also Available

SCHOTT NG Gray Glass Neutral Density (ND) Filters feature nearly constant transmittance in the visible spectrum, attenuating light through absorption. The filters are available in 6 materials, each with a thickness of 1, 2, or 3mm. Filters can be stacked to achieve custom optical densities. SCHOTT NG Gray Glass Neutral Density (ND) Filters are used in a variety of machine vision, factory automation, and analytical instrumentation applications. Custom sizes from 5 to 160mm are available upon request; for more information, visit our Colored Glass Filter Manufacturing capabilities webpage. SCHOTT NG Absorptive Neutral Density (ND) Filters with precision optical density and transmission values are also available.

While SCHOTT NG Gray Glass Neutral Density (ND) Filters will provide consistent transmission values from 400 - 700nm, variations in filter lot manufacturing may lead to variations in transmission from filter to filter. Please see the table in the Technical Information tab for acceptable transmission variations for each glass type and thickness.

Filter Simulation Software

Click here to download SCHOTT’s colored glass filter calculation program which can be used to calculate the internal transmittance and external transmission of each SCHOTT glass type. The program can simulate the performance of individual filters with user specified thickness or of stacked filters with varying glass types and thicknesses.

Interactive transmission curves are also available here.

Immediate Custom Quotes Available

If you have a need for any round, square, or rectangular size of a SCHOTT NG Gray Glass Neutral Density (ND) Filter in dimensions between 5mm and 50mm, please visit our Colored Filter Glass Tool.  We’ll provide an immediate quote, and can deliver the part to your requested size in approximately 2 weeks.  A full list of standard manufacturing tolerances and restrictions are listed.  For fully customized filters to your requirements, visit our Customized Optical Filter Glass Capabilities page.

Technical Information

 Glass Type Thickness Min. Transmission (%) Max. Transmission (%)
NG3 1 7.4 11.1
2 0.01 2.8
3 0.01 1.9
NG4 1 24.9 31.3
2 6.1 11.6
3 0.01 5.5
NG5 1 49.8 55.4
2 27.2 32.8
3 14.3 19.9
NG9 1 1.8 5.5
2 0.01 2.0
3 0.01 1.8
NG11 1 70.1 73.8
2 54.2 57.9
3 42.2 45.9