Antlia SII 3 nm Pro Narrowband — 36 mm unmounted Antlia's Pro series 3 nm SII filter isolates the sulphur doublet (671.6 / 673.1 nm), separating it cleanly from H-alpha, with OD5 blocking from 300 to 1000 nm for high-contrast SHO imaging.
Manufacturer model: Antlia SII 3nm Pro, 36 mm unmounted · Specifications checked against manufacturer data on 2026-11-03
Antlia's Pro series 3 nm SII filter isolates the sulphur doublet (671.6 / 673.1 nm), separating it cleanly from H-alpha, with OD5 blocking from 300 to 1000 nm for high-contrast SHO imaging.
| Lines | SII doublet, 671.6 / 673.1 nm |
|---|---|
| Bandwidth (FWHM) | 3 nm |
| Peak transmission | Over 88% |
| Blocking | Over OD5, 300–1000 nm |
| Thickness | 2 mm ±0.05 mm |
| Format | 36 mm diameter, unmounted |
Antlia page conflict: prose 671.6 nm vs table CWL 672.4 nm; exact CWL withheld, doublet lines shown.
Ficha técnica
Antlia SII 3 nm Pro Narrowband — 36 mm unmounted Antlia's Pro series 3 nm SII filter isolates the sulphur doublet (671.6 / 673.1 nm), separating it cleanly from H-alpha, with OD5 blocking from 300 to 1000 nm for high-contrast SHO imaging.
Manufacturer model: Antlia SII 3nm Pro, 36 mm unmounted · Specifications checked against manufacturer data on 2026-11-03
