Filter · MSRP $590
Antlia 2.5nm Ha Ultra Filters Set - 2" Mounted
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | H-alpha 656.3nm |
| Bandwidth | 2.5 nm |
| Filter size | 2" |
| Mounted | Yes |
About
A 2.5nm FWHM H-alpha filter from the Ultra series in a 2" mounted cell, coated on quartz glass for thermal stability and rated for ≥95% transmission at 656.3nm with OD5 blocking; recommended for optics at f/3.5 or slower.