Antlia ALP-T 5nm H-alpha/OIII Dual-Band Filter - 2" Mounted

Name: Antlia ALP-T 5nm H-alpha/OIII Dual-Band Filter - 2" Mounted
Brand: Antlia

Antlia

Antlia ALP-T Dual Band is a Dual narrowband nebula filter in 2" mounted for nebula imaging and light-polluted skies.

imaging-filter $$$ Light pollution Nebulae One-shot color

Antlia ALP-T 5nm H-alpha/OIII Dual-Band Filter - 2" Mounted

Best Current Offer

Agena AstroProducts

In stock

$418.00

Other retailers

Starizona (In stock)
$418.00
Telescopes.net (In stock)
$418.00

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 9/19/2026	View Offer - $418.00
Starizona Starizona	$418.00	In stock Updated 9/20/2026	View Offer - $418.00
Telescopes.net Telescopes.net	$418.00	In stock Updated 9/20/2026	View Offer - $418.00

Price History

Chronological retailer pricing with out-of-stock points shown at reduced opacity.

Agena AstroProducts Starizona Telescopes.net