Specific Parameters for [FeII] 1644 nm Filters
- Thickness: 1.12 mm.
- Usable Aperture: 29 x 29 mm square.
- Dimension: 32.02 mm x 32.02 mm square.
Filter ID # | Center l(77K)
| Bandwidth (77K) | Short Slope | Long Slope
| Peak Transmission |
1 | 1637.6
| 20.40 | 0.86 | 0.83
| 77.1 |
2 | 1637.7
| 20.34 | 0.87 | 0.83
| 77.5 |
3 | 1637.8
| 20.40 | 0.86 | 0.83
| 77.1 |
4 | 1637.8
| 20.33 | 0.86 | 0.82
| 77.4 |
5 | 1637.9
| 20.41 | 0.86 | 0.83
| 77.0 |
6 | 1638.3
| 20.43 | 0.86 | 0.82
| 76.8 |
All values given in nm or percentages.
Transmission curves of witness piece
François Piché
Latest Revision: August 14, 1997