Astronomy Specialist

ANTLIA Ha 3nm PRO ULTRA NARROWBAND FILTER 36mm

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$522.00

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The Antlia H-Alpha 3nm PRO ultra narrow-band is the latest filter produced by Antlia. This filter boosts the contrast of emission nebulae and supernova remnants for professional results, even under a bright sky affected by light pollution.

The 3.0 nm band pass is only 1% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images and extremely dark backgrounds. To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter.

The maximum transmission of the Hydrogen Alpha line (656.3 nm) is above 90% and the transmission off band is only 0.1%. This is a value often undisclosed by other filter producers and it is critical to darken the sky background and minimise the halos around the stars.

Blue-shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.

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.

The filter cuts off the ultraviolet and infrared light so there is no need to use the IR-cut filter.

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


 

Passing band 3 nm (FWHM)
Glass thickness

2.0 mm ±0.05

Optical flatness

1/4 λ (wavefront)

Bandpass transmission 90%
Off-band transmission <0.1% (OD3) @ 300-1050 nm
Coating Double-sided multilayer nano-coating
Surface quality 60/40 (in accordance with US military watch MIL-O-13830)
Parallelism 30"
Glass type Schott monolithic optical substrate (non glued)
Filter size Unmounted 36 mm
SKU 2" filter
AN-Ha3nm36

 

H-Alpha filter transmission curve


H-Alpha filter absorption curve

 

Seagull Nebula by Robert Theunissen | APM LZOS 130/780, ZWO ASI2600MM Pro, Antlia 3.5nm & 3nm Ha, OIII & SII, iOptron CEM40   Seagull Nebula by Robert Theunissen | APM LZOS 130/780, ZWO ASI2600MM Pro, Antlia 3.5nm & 3nm Ha, OIII & SII, iOptron CEM40

 

Tarantula Nebula - QHY268M with Antlia 3nm Pro H-alpha & OIII filters by Caleb Kam

 

Tarantula Nebula - QHY268M with Antlia 3nm Pro H-alpha & OIII filters by Caleb Kam.

 

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Crescent Nebula (NGC 6888) taken with Antlia filters by Andrea Maggi.
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