Filter · 2022– · MSRP $389
Optolong L-Ultimate 2"
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | OIII 500.7 nm + Ha 656.3 nm |
| Bandwidth | 3 nm |
| Filter size | 2" |
| Mounted | Yes |
About
Dual 3 nm H-alpha and OIII narrowband filter that isolates nebula emission lines and blocks light pollution, with optimized halo performance; not suited to fast focal ratio systems. 2-inch mounted.