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SCHOTT NG Absorptive Neutral Density (ND) Filters consist of NG4, NG9, or NG11 SCHOTT glass types and provide even light attenuation through absorption in the visible spectrum. These filters are manufactured to achieve a specified optical density, ranging from 0.15 to 5.0, to simplify integration into optical systems. SCHOTT NG Absorptive Neutral Density (ND) Filters are available in a standard 50 x 50mm size and multiple filters can be stacked to achieve custom optical densities. Custom sizes from 5 to 160mm as well as custom optical densities or transmission values for specific wavelengths are available on request; for more information, visit our Colored Glass Filter Manufacturing capabilities webpage. SCHOTT NG Gray Glass Filters are also available.
Each filter lot is measured and thickness is adjusted to meet the specified transmission value at 546nm. Variations in filter lot performance can result in variations in nominal thickness; however, the transmission variations between lots will be minimal.
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.
Title | Compare | Stock Number | Price | Buy | |
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12.5mm Dia., SCHOTT NG Absorptive ND Filter Kit (14 Filters) | #15-094 | €276,00 Request Quote |
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25mm Dia., SCHOTT NG Absorptive ND Filter Kit (14 Filters) | #15-095 | €510,00 Request Quote |
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50mm Sq., SCHOTT NG Absorptive ND Filter Kit (14 Filters) | #15-096 | €1.090,00 Request Quote |
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Edge length and diameter | +/-0.2 mm |
Thickness | For ≤ 1mm: ± 0.1mm For > 1 – 3mm: ± 0.2mm |
Surface Quality | 60 – 40 |
Surface Accuracy | ≤8 Waves |
Parallelism | ≤3 arcmin |
Clear Aperture | ≥90% |
Edges & Bevels | Round parts ≥ ∅5mm: polished edges & protective bevel Square & rectangular parts < 50 x 50mm: polished edges, no bevel |
Edge Chips | For ≤ ∅80mm: < 0.3mm (5/E0.3), for ≥ ∅81mm < 0.6mm (5/E0.6) |
Polishing quality | P2 |
Defects | 5/3 x 0.63 |
All edges machined | |
Round filters with chamfer max. 0.5mm, square and rectangular < 50x50mm without chamfer | |
Edge chips permitted up to 5/E0.3 |
General Information SCHOTT Optical Filter Glass: | |||||
BG | Blue, blue-green, and multiband glasses | ||||
GG | Nearly colorless to yellow glasses, IR transmitting | ||||
KG | Virtually colorless glasses with high transmission in the visible and absorption in the IR | ||||
NG | Neutral density glasses with uniform attenuation in the visible range | ||||
OG | Orange glasses, IR transmitting | ||||
RG | Red and black glasses, blocking visible, IR transmitting | ||||
UG | Black and blue glasses, UV transmitting | ||||
VG | Green glasses | ||||
WG | Colorless glasses with different cut-offs in the UV, transmitting in the visible and IR ranges | ||||
Note: The spectral curves above show the internal transmittance of the individual optical filter glasses |
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