Antlia ALP-T Dual Band 5nm Ha&OIII Filter - 2" Mounted

Article number: ALP-T-2
Availability: More on the Way to us
Delivery time: More on the Way to Us

Antlia ALP-T Dual Band 5nm Ha&OIII Filter


The Antlia ALP-T dual band 5nm Ha&OIII filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on Antlia ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.

The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.



Application and Performance:

Engineered specifically for use with DSLR, CMOS, and CCD color cameras

Suppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise

Extremely steep bandpass edges minimize internal reflections

Ideal flat-top and moderate bandpass reducing spectrum down shifts

Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter

Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8

Near IR (NIR) is blocked up to 1100nm



Technical Specifications:



Oxygen III




CWL (Central Wavelength)



Peak Transmission




≥OD4.5 @ 300-1100nm

Filter Thickness


It is advised to use with Antlia ALP-T Dual Band 5nm SII&Hb filter.



Spectrum Curve:

2023 ALP-T 5nm Ha&OIII Spectrum Curve.jpg

Filter Ring:

2’’ (M48*0.75)

Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture

Black Anodized Finish

Laser Engraving No Fading


Not Recommended:

Solar imaging

Night visual observation


Not Permitted:


Serious eye damage will result if you fail to observe the warning.


Additional independent tests and reviews are available here, please credit the photographer's names if you use their images on your website.

IC434_ALP_T +.jpg


Target: IC434 – Horse Head and Flame Nebulae

- Telescope: Skywatcher 130mm F5 w/MPCC

- Mount: Losmandy G11

- Camera : IMX571 26000KPA

- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’

- Exposure info: 300s X 24

Bortle scale 5

Copyright: Hyunsu Lee(South Korea)


Target: NGC2244 – Rosette Nebula
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera: IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
- Exposure info: 300s X 30

Bortle scale 5

Copyright: Hyunsu Lee(South Korea)

NGC 6960_Western Veil nebula+.jpg

Target: Western Veil nebula

- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera: IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
- Exposure info: 300s X 7

Bortle scale 5

Copyright: Hyunsu Lee(South Korea)


Target: IC63 - The Phantom of Cassiopeia
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera : IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’

- Exposure info: 300s X 32

Bortle scale 5

Copyright: Hyunsu Lee(South Korea)


Target: Aldebaran(Magnitude:0.85)
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera: IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’

Copyright: Hyunsu Lee(South Korea)

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