Colored Glass Filters
COLORED GLASS FILTERS
Neutral Density Filters (ND)
These filters possess level spectral transmittance characteristics in the visible region independent of wavelength.
They are ideal for exposure control in color photography, and are also used for light control in other measuring instruments.
They are designed to uphold designated performance capabilities through controlling the thickness.
Application: Camera
Images: ND70 / ND03 from top
The following 17 types of neutral density filters are available as standard items in 50-mm squares in addition to the 7 types of items listed in the table of material properties.
ND0/ ND1/ ND10/ ND20/ ND40/ ND70/ ND0.1/ ND3/ ND13
ND25/ ND50/ ND80/ ND03/ ND5/ ND15/ ND30/ ND60
Transmittance
![[Transmission simulation software] This software facilitates obtaining data of spectral transmittance characteristics after changing the thickness of the glass.](https://hoyaoptics.com/wp-content/uploads/2019/10/bnr_simulationsoft.jpg)
Neutral Density Filter: Data
| Item | Standard Value | Color specification (Standard illuminants A) | Thickness | Refractive Index | Chemical property | Thermal properties | Mechanical properties | Specific gravity | Raw material | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tav (%) | x | y | mm | 600nm | DW | DA | Tg | Ts | α -30/70 | α 100/300 | HK | FA | d | ||
 ND001 | 0 | – | – | (2.50) | 1.555 | 2 | 1 | 492 | 557 | – | 76 | – | – | 2.47 | ND001 |
| ND006 | <0.06 | – | – | (2.50) | 1.531 | 2 | 1 | 542 | 622 | – | 76 | – | – | 2.47 | ND006 |
| ND03 | 0.3±0.05 | – | – | (2.85) | 1.513 | 1 | 3 | 490 | 565 | – | 65 | 530 | 100 | 2.41 | ND03 |
| ND13 | 12.5±2 | 0.447 | 0.419 | (2.42) | 1.516 | 1 | 1 | 535 | 595 | 58 | 68 | 530 | 100 | 2.43 | ND13 |
| ND25 | 25±2.5 | 0.444 | 0.418 | (2.61) | 1.516 | 1 | 2 | 535 | 600 | 62 | 66 | 550 | 100 | 2.42 | ND25 |
| ND40 | 40±4 | 0.448 | 0.413 | (2.73) | 1.506 | 2 | 3 | 525 | 570 | 61 | 65 | 550 | 100 | 2.42 | ND40 |
| ND50 | 50±5 | 0.448 | 0.412 | (2.50) | 1.505 | 2 | 4 | 495 | 555 | 62 | 66 | 550 | 90 | 2.42 | ND50 |
| ND70 | 70±5 | 0.448 | 0.411 | (2.90) | 1.504 | 4 | 5 | 470 | 540 | 66 | 72 | 510 | 100 | 2.39 | ND70 |
* The listed data are standard values. As we are always improving our products, the data listed are subject to change without notice.