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Absorptive neutral-density filters provide an alternative to metallic neutral-density filters. They are preferred when elimination of backscatter and back reflections are of particular concern.
Absorptive filters vary in thickness from less than a millimeter to nearly five millimeters, depending on the material and the melt. Since there can be large variations between glass melts, actual thickness and glass material may vary in order to guarantee optical density.
 Standard Specifications:
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Optical Material:
Diameter Tolerance:
Parallelism:
Clear Aperture:
Surface Quality:
Wavefront Distortion:
Bevel:
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Optical Neutral Density Glass
+0.0, -0.15mm
3 arc minutes
>85%
40-20 scratch and dig
2lambda per 25mm
<0.25mm X 45°
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Standard Absorptive ND Filters:
Diameter(mm) |
Transmission |
Material |
Optical Density |
Product Number |
25.0 |
79.43% |
NG Glass |
0.1 |
UQT-NDG0101 |
25.0 |
63.10% |
NG Glass |
0.2 |
UQT-NDG0102 |
25.0 |
50.12% |
NG Glass |
0.3 |
UQT-NDG0103 |
25.0 |
39.81 |
NG Glass |
0.4 |
UQT-NDG0104 |
25.0 |
31.62 |
NG Glass |
0.5 |
UQT-NDG0105 |
25.0 |
25.12 |
NG Glass |
0.6 |
UQT-NDG0106 |
25.0 |
19.95 |
NG Glass |
0.7 |
UQT-NDG0107 |
25.0 |
15.85 |
NG Glass |
0.8 |
UQT-NDG0108 |
25.0 |
12.59 |
NG Glass |
0.9 |
UQT-NDG0109 |
25.0 |
10.00 |
NG Glass |
1.0 |
UQT-NDG0110 |
25.0 |
3.16 |
NG Glass |
1.5 |
UQT-NDG0111 |
25.0 |
1.00 |
NG Glass |
2.0 |
UQT-NDG0112 |
25.0 |
0.100 |
NG Glass |
3.0 |
UQT-NDG0113 |
25.0 |
0.01 |
NG Glass |
4.0 |
UQT-NDG0114 |
25.0 |
0.001 |
NG Glass |
5.0 |
UQT-NDG0115 |
50.0 |
79.43% |
NG Glass |
0.1 |
UQT-NDG0201 |
50.0 |
63.10% |
NG Glass |
0.2 |
UQT-NDG0202 |
50.0 |
50.12% |
NG Glass |
0.3 |
UQT-NDG0203 |
50.0 |
39.81 |
NG Glass |
0.4 |
UQT-NDG0204 |
50.0 |
31.62 |
NG Glass |
0.5 |
UQT-NDG0205 |
50.0 |
25.12 |
NG Glass |
0.6 |
UQT-NDG0206 |
50.0 |
19.95 |
NG Glass |
0.7 |
UQT-NDG0207 |
50.0 |
15.85 |
NG Glass |
0.8 |
UQT-NDG0208 |
50.0 |
12.59 |
NG Glass |
0.9 |
UQT-NDG0209 |
50.0 |
10.00 |
NG Glass |
1.0 |
UQT-NDG0210 |
50.0 |
3.16 |
NG Glass |
1.5 |
UQT-NDG0211 |
50.0 |
1.00 |
NG Glass |
2.0 |
UQT-NDG0212 |
50.0 |
0.100 |
NG Glass |
3.0 |
UQT-NDG0213 |
50.0 |
0.01 |
NG Glass |
4.0 |
UQT-NDG0214 |
50.0 |
0.001 |
NG Glass |
5.0 |
UQT-NDG0215 |
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| Please Contact ultiQuest for other dimensions in prototype and production quantities. |
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| NOTES! |
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For absorptive neutral density filters, the effect of the color coupler differs with manufacturing lots according to glass dissolution conditions. Since transmittance is adjusted with plate thickness, the standard plate thickness is shown for reference only. |
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Be sure to wear laser safety goggles when checking optical path and adjusting optical axis. |
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