Astronomik OIII 6nm 36mm
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | OIII 496 + 501nm |
| Bandwidth | 6 nm |
| Filter size | 36mm |
About
A 6 nm narrowband filter isolating the doubly-ionised oxygen lines at 496 and 501 nm, blocking sodium and mercury street lighting, airglow and most moonlight. The 6 nm width suits faint objects in crowded Milky Way fields, low dark-current cameras and heavily light-polluted sites. MFR coating, 36 mm round with a protective ring.