Antlia Triband RGB Ultra II — 2" mounted The Antlia Triband RGB Ultra II is a light-pollution filter for one-shot-colour and mono cameras. It passes H-alpha, NII, SII, OIII and H-beta with high transmission while blocking artificial light. The II version adds the 486.1 nm H-beta line to the original Triband RGB Ultra, bringing out finer nebula detail.
Manufacturer model: Antlia Triband RGB Ultra Filter II, 2-inch mounted · Specifications checked against manufacturer data on 2026-11-03
The Antlia Triband RGB Ultra II is a light-pollution filter for one-shot-colour and mono cameras. It passes H-alpha, NII, SII, OIII and H-beta with high transmission while blocking artificial light. The II version adds the 486.1 nm H-beta line to the original Triband RGB Ultra, bringing out finer nebula detail.
Its balanced transmission keeps colour casts minimal on stars, galaxies and clusters, so Antlia says it suits over 90% of deep-sky targets. A broad bandpass lets it work with optics as fast as f/2 with minimal loss or spectral shift. With mono cameras it can replace luminance for nebulae and galaxies, though not for dark nebulae. Antlia also notes it can be used visually with large telescopes.
| Lines passed | H-alpha 656.3; NII 654.8/658.3; SII 671.6/673.1; OIII 495.9/500.7; H-beta 486.1 nm |
|---|---|
| Peak transmission | Over 92% at each line |
| Blocking | OD4 or better, 300–1050 nm |
| Thickness | 2 mm ±0.05 mm |
| Fastest focal ratio | f/2 |
| Cameras | OSC and mono |
| Format | 2-inch mounted |
Version II (adds H-beta), not original Triband RGB Ultra. Band FWHM not tabulated.
| Fastest focal ratio | f/2 |
|---|
Data sheet
Antlia Triband RGB Ultra II — 2" mounted The Antlia Triband RGB Ultra II is a light-pollution filter for one-shot-colour and mono cameras. It passes H-alpha, NII, SII, OIII and H-beta with high transmission while blocking artificial light. The II version adds the 486.1 nm H-beta line to the original Triband RGB Ultra, bringing out finer nebula detail.
Manufacturer model: Antlia Triband RGB Ultra Filter II, 2-inch mounted · Specifications checked against manufacturer data on 2026-11-03
