Filter · MSRP $465
Antlia 2.5nm SII Ultra Filter Set - 36mm Unmounted
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | SII 671.6/673.1nm |
| Bandwidth | 2.5 nm |
| Filter size | 36mm |
| Mounted | No |
About
A 2.5nm FWHM SII filter from the Ultra series, coated on quartz glass for thermal stability, rated for ≥95% transmission at the 671.6/673.1nm lines and OD5 blocking; recommended for optics at f/3.5 or slower.