Antlia H-Alpha 3nm Narrowband Filter - 36mm

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Antlia's 3nm H-Alpha Pro 36mm filter cuts out light pollution that enhances contrast for vibrant deep-sky astrophotography, even in bright skies.

OUR PRICE $529.00

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    Capture stunning deep-sky images even under light-polluted skies with the Antlia H-Alpha 3nm PRO filter. This ultra-narrowband filter excels at boosting the contrast of emission nebulae and supernova remnants, delivering professional-grade results.

    Here's why astrophotographers love it:

    • Unmatched Contrast: The ultra-thin 3.0nm bandpass (only 1% of the visible spectrum) maximizes signal-to-noise ratio, resulting in exceptionally high contrast images with deep, dark backgrounds.

    • Enhanced Suppression: Edge-blackening coating minimizes stray light and internal reflections, further darkening the sky and reducing star halos.

    • Exceptional Transmission: With over 90% transmission at the key Hydrogen Alpha line (656.3nm) and only 0.1% transmission outside the band your images will come to life.

    • Fast Optics Ready: Tested for use with systems as fast as f/3, including Hyperstar and RASA, with minimal signal loss, ensuring compatibility with your setup.

    • Parfocal Design: Each filter is individually tested and guaranteed to meet strict tolerances, ensuring parfocality across your filter set.

    • Convenience: Eliminates the need for an additional IR-cut filter by blocking both ultraviolet and infrared light.



    Passing band 3 nm (FWHM)
    Glass thickness 2.0 mm ±0.05 (3.0 mm for 50 mm round & 50 x 50 mm square)
    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 sizes Mounted 1.25", 2", Unmounted 31 mm, 36 mm, 50 mm round, 50 x 50 mm square


    Important Note: Never look directly at the sun through this filter, as it can cause severe eye damage.

    Antlia: Experts in Astronomy Filters

    Antlia Astronomy Filters are built by Deep-Sky Photography Enthusiasts for Enthusiasts all around the globe. Antlia prides itself on producing a series of exceptional quality, fully multicoated narrowband, dual-band, planetary and LRGB filters for astrophotography, designed for use with a range of monochrome and colour DSLR, CMOS and CCD cameras.

    Product Code: ANT-Ha3nm36


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