Antlia SII 3nm Narrowband Filter - 36mm

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The Antlia 3nm S-II 36mm filter is designed for unparalleled contrast as it helps you capture the breathtaking details of emission and planetary nebulae, Wolf-Rayet nebulae, and supernova remnants. Even under light-polluted skies, this advanced filter delivers professional-grade results.

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    The Antlia 3nm S-II PRO Filter

    The Antlia 3nm S-II PRO filter stands as a testament to precision engineering and its impact on celestial imaging. This ultra-narrowband filter boasts a mere 3.0 nm bandwidth, isolating the critical 671.6 nm Sulphur II emission line with unparalleled accuracy. This translates to a dramatically improved signal-to-noise ratio, unlocking the intricate details of emission nebulae, planetary nebulae, Wolf-Rayet nebulae, and supernova remnants.

    Impeccable Performance: Uncompromising in its pursuit of contrast, the 3nm S-II PRO employs a sophisticated edge-blackening coating. This meticulously applied treatment effectively mitigates stray light and internal reflections, resulting in a maximum transmission of over 90% within the desired band. Off-band light is suppressed by an astonishing 99.999%, yielding profoundly darkened backgrounds and minimizing star halos. Even the faintest nebular structures now have the opportunity to shine.

    Universal Adaptability: Designed with versatility in mind, the 3nm S-II PRO seamlessly integrates with a diverse array of telescopes, including optics as fast as f/3. This adaptability minimizes signal loss and ensures compatibility with demanding setups like Hyperstar and RASA, empowering astrophotographers with greater flexibility.

    Rigorous Quality Assurance: Each filter undergoes stringent individual testing to guarantee exceptional quality. The substrate's tight tolerances ensure parfocality, eliminating the need for refocusing when switching filters. Additionally, the filter effectively cuts off both ultraviolet and infrared light, rendering a separate IR-cut filter superfluous.

    Empowering Deep Sky Exploration: The Antlia 3nm S-II PRO filter stands as a powerful tool for professional astrophotographers, pushing the boundaries of their craft and unlocking the hidden beauty of the cosmos. With its meticulous design and uncompromising performance, this filter empowers the capture of breathtaking deep-sky images, brimming with detail and contrast, even in light-polluted environments. It is an invaluable asset for those seeking to unveil the universe's most captivating secrets and share them with the world.

    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 (3.0 mm for 50 mm round & 50 x 50 mm square)
    Optical flatness
    1/4 λ (wavefront)
    Bandpass transmission 90%
    Off-band transmission <0.001% (OD5) @ 300-1000 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 Mounted 1.25", 2", Unmounted 31 mm, 36 mm, 50 mm round, 50 x 50 mm square


    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-SII3nm36

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