Antlia ALP-T 5nm H-alpha/OIII Dual-Band Filter - 2" Mounted
Antlia
Antlia ALP-T Dual Band is a Dual narrowband nebula filter in 2" mounted for nebula imaging and light-polluted skies.
Best Current Offer
Specifications
Filter
- Filter type
- Dual narrowband nebula filter
- Filter size
- 2" Mounted
Spectral
- Passbands
- H-alpha 656.3 nm (5 nm) / OIII 500.7 nm (5 nm)
- Band count
- 2 bands
- Narrowest bandpass
- 5 nm
- Blocking
- OD 4.5 suppression of unwanted wavelengths
Specifications
- Transmission
- 90%
- Thickness
- 2 mm
Construction
- Substrate / coating
- Advanced multi-coatings with steep bandpass edges
Use
- Camera use
- One-shot color astronomy cameras; also usable with mono cameras
- Best for
- Emission nebulae under moonlight or light pollution
Astrophotography Fit
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
Antlia ALP-T Dual Band is a premium Dual narrowband nebula filter (2" mounted). Passbands: H-alpha 656.3 nm (5 nm) / OIII 500.7 nm (5 nm).
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.
Best paired with
- One-shot color cooled cameras or modified DSLRs
- Emission nebulae rich in H-alpha, OIII, SII, or H-beta signal
- Filter drawer or wheel sized to avoid vignetting
Not recommended for
- Broadband galaxies, reflection nebulae, or clusters as the main use case
- Monochrome SHO workflows that need separate channels
- Very fast optics unless bandpass shift and halos have been checked
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Agena AstroProducts Agena AstroProducts | $418.00 | In stock Updated 5/13/2026 | View Offer - $418.00 |
| Starizona Starizona | $418.00 | In stock Updated 5/15/2026 | View Offer - $418.00 |
| Telescopes.net Telescopes.net | $418.00 | In stock Updated 5/13/2026 | View Offer - $418.00 |