Astronomy Specialist

ANTLIA ALP-T Ha & OIII DUAL BAND FILTER

$649.00 AUD
SKU: AN-ALP-T2

Antlia

  • 5 nm

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The Antlia ALP-T Golden H-alpha and O-III Dual Band filter is specifically designed for astrophotography with colour DSLR, CMOS or CCD cameras in areas with heavy light pollution. Its two 5nm passing bands are exceptional at isolating nebulae emissions in H-Alpha and OIII. The optical density of 4.5 suppresses unwanted wavelengths from light pollution, moonlight and skyglow, resulting in superior signal-to-noise ratio and better contrast.

The 36mm unmounted variant comes with a handy mounting adapter so you can use it with 2" filter drawers and accessories!

Like all Antlia filters, the Golden Dual Band filter has excellent halo suppression, making imaging of targets surrounded by bright stars such as the Horsehead Nebula pain-free.

 

 

IC 434 by Hyunsu Lee | SkyWatcher 130mm f/5 with MPCC, IMX571, 2" Antlia Golden Dual Band filter, 300 sec x 24, Bortle 5.

 

  • It blocks the artificial light from mercury vapour lamps, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
  • Maximum transmission of the main nebula emission lines at OIII (500.7nm) is >82% and H-alpha (656.3nm) is >90%. Good signal is still achievable with optics as fast as f/3.
  • Two transmission bands with a bandpass of 5nm. OD4.5 @ 300-1100nm.
  • Ideal for urban areas with extreme light pollution.
  • It incorporates an IR/UV-Cut filter that is necessary in astrophotography, especially for astronomy cameras that are sensitive to the infrared radiation.
  • Ultra-thin filter cell to maximise the compatibility with most filter drawers.
  • Ideal flat-top and moderate bandpass reduces spectrum down shifts.
  • Good performance at focal ratios slower than f/3.

To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter. Each filter is individually tested to ensure a high quality standard. The tight tolerance of the filters substrate assure a maximum deviance of ±0.05 from specifications making these filters parfocal.

DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will occur.

 

 

Passing band 5 nm (FWHM)
Glass thickness

2.0 mm ±0.05

Optical flatness

1/4 λ (wavefront)

Bandpass transmission H-a >90%, OIII >82%
Off-band transmission OD4.5 @ 300-1100 nm
Coating Double-sided multilayer nano-coating
Surface quality 60/40 (in accordance with US military watch MIL-O-13830)
Parallelism 30"
SKU
2" - AN-ALP-T, 36mm - AN-ALP-T-36


 

 

 

Tarantula Nebula by Adriano Massatani | Sharpstar 200PNT f/3.2, QHY268C, 2" Antlia Golden Dual Band filter.

 

 

IC 63 by Hyunsu Lee | SkyWatcher 130mm f/5 with MPCC, IMX571, 2" Antlia Golden Dual Band filter, 300 sec x 32, Bortle 5.

 

 

NGC 2244 by Hyunsu Lee | SkyWatcher 130mm f/5 with MPCC, IMX571, 2" Antlia Golden Dual Band filter, 300 sec x 30, Bortle 5.

Customer Reviews

Based on 8 reviews
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J
Jon
Awesome

Getting some really great results with this filter. Using a GSO 200mm f4 Newt and self astro modified Canon 600d. Pics are of Carina, Lagoon and Trifid nebula.

J
Jay Taylor
Best thing you can get for a OSC

Fantastic filter probably the best thing I've gotten for my setup in regards to image quality and being able to image longer into the moon cycle. I wouldn't recommend imaging under a completely full moon with it as the blue signal is still lost to the background a bit. My sample also has haloing on stars brighter than magnitude 6

C
Craig
Brilliant.

Brilliant for emission nebula. Really brings out the detail so much better. Even works brilliantly on full moon nights. Transforms the experience. Can't comment on heavily light polluted sky performance as lucky for me that's not a problem... Yet...

J
J.H.
Great filter for use in light polluted skies

First night out - 1 day past full moon, my bortle 8 skies innner west of Sydney - it really could not be worse. Wow, happy! No nasty gradients to deal with, tight stars. I have used the STC duo previously and this is way better for my situation. A little expensive but looks to be the best duo filter available. Attached is 36*6 mins on ic4628 with an asi294mc and Askar FRA400 mapped to hubble palette.

C
Craig
Worth it

Works amazingly well in my light polluted skies, used it twice now with great results each time.