issue date：2016-3-31 15:35:44 visit frequency：3088
Neutral Density (ND) Filters are designed to reduce transmission evenly across a portion of the spectrum by absorbing or reflecting the portion of the light that is not being transmitted. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission. ND Filters are often used in imaging or laser applications where excessive light can be damaging to camera sensors or other optical components. ND Filters are also ideal for preventing excessive light from causing inaccurate results in photometer applications.
|
Typical Characteristics |
|
|
Substrate |
ND Filter Glass |
|
Diameter |
25.0mm |
|
Dimensional Tolerance |
±0.1mm |
|
Thickness |
1.20mm |
|
Thickness Tolerance |
±0.1mm |
|
Surface Quality |
60-40 |
|
Design Wavelength(DWL) |
400-700nm |
|
Optical Density(OD) |
0.10 |
|
Optical Density Tolerance |
±5% |
|
Transmission |
＞80% |
|
Transmission Tolerance |
±5% |
|
Surface Accuracy |
＜λ/2@632.8nm |
|
Parallelism |
＜3′ |
|
RoHS |
Compliant |
|
Neutral Density Filter reduces the brightness of an image without changing the color of the scene. It allows all wavelengths to pass through equally. OD=Log(1/T) |
|||
|
OD |
T% |
OD |
T% |
|
0.10 |
79% |
0.15 |
70% |
|
0.20 |
63% |
0.30 |
50% |
|
0.40 |
40% |
0.50 |
32% |
|
0.60 |
25% |
0.70 |
20% |
|
0.90 |
12.5% |
1.00 |
10% |
|
1.30 |
5% |
1.50 |
3.2% |
|
2.00 |
1.0% |
2.50 |
0.3% |
|
3.00 |
0.1% |
4.00 |
0.01% |
|
5.00 |
0.001% |
6.00 |
0.0001% |
|
Part No |
Thickness |
T% |
Tolerance |
|
NDF-02 |
2mm |
2.0% |
0.5 ~ 3.0% |
|
NDF-05 |
2mm |
5.0% |
1.0 ~ 9.0% |
|
NDF-10 |
2mm |
10.0% |
6.0 ~ 15.0% |
|
NDF-25 |
2mm |
25.0% |
18.0 ~ 32.0% |
|
NDF-30 |
2mm |
30.0% |
23.0 ~ 37.0% |
|
NDF-50 |
2mm |
50.0% |
41.0 ~ 59.0% |
|
NDF-65 |
2mm |
65.0% |
58.0 ~ 72.0% |
|
NDF-70 |
2mm |
70.0% |
63.0 ~ 77.0% |
|
Custom size available |
|||
next：Bandpass Filters