Astronomik SII 6nm 2" (M48)
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | SII 671.7 + 673.0nm |
| Bandwidth | 6 nm |
| Filter size | 2" |
| Mounted | Yes |
About
A 6 nm narrowband filter isolating the sulphur-II lines at 671.7 and 673.0 nm, blocking sodium and mercury street lighting, airglow and most moonlight from UV through IR. The 6 nm width suits faint objects in crowded Milky Way fields, low dark-current cameras and heavily light-polluted sites. MFR coating, 2" M48 mount.