Filter · 2009–
Celestron Oxygen III Narrowband Filter 1.25"
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | OIII 496/501nm |
| Filter size | 1.25" |
| Mounted | Yes |
About
Narrowband OIII filter isolating the doubly-ionized oxygen lines (496/501nm) for extreme contrast on planetary and emission nebulae; blocks 400-700nm elsewhere.