Antlia ALP-T 3nm H-alpha/OIII Dual-Band Filter - 2" Mounted
Antlia
Antlia ALP-T Dualband 3nm Ha & OIII Filter for f/4 & Slower Telescopes - 2" Mounted is a multi-band nebula filter in 2" for nebula imaging and light-polluted skies.
Best Current Offer
Specifications
Filter
- Filter type
- Dual-band / multi-band nebula filter
- Filter size
- 2" / Mounted
- Transmission
- 90%
Spectral
- Passbands
- H-alpha 656.3 nm (3 nm) / OIII 500.7 nm (3 nm)
- Band count
- 2 bands
- Narrowest bandpass
- 3 nm
Specifications
- Thickness
- 2 mm
- Substrate / coating
- Optical single non-glued substrate
Use
- Camera use
- Color or mono astronomy cameras, depending on target and workflow
Astrophotography Fit
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
Antlia ALP-T Dualband 3nm Ha & OIII Filter for f/4 & Slower Telescopes - 2" Mounted is a midrange multi-band nebula filter (2").
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 | $429.00 | In stock Updated 8/5/2026 | View Offer - $429.00 |
| Starizona Starizona | $429.00 | Out of stock Updated 8/5/2026 | View Offer - $429.00 |
Price History
Chronological retailer pricing with out-of-stock points shown at reduced opacity.