Antlia Edge SII 4.5nm Narrowband Filter - 2"

Product Image

The Antlia Edge SII 2 inch narrowband filter has a narrow bandpass of 4.5nm that allows it to isolate Sulphur emission lines from nebulae and other celestial objects. This results in higher contrast and signal-to-noise ratio in your images, allowing you to capture more detail. 

OUR PRICE $499.00

Dispatch in 3-5 Days

Add to wishlist

Shipping Calculator

    The Antlia S-II 4.5nm Edge narrowband filter is not just an affordable alternative; it's a meticulously crafted instrument designed to unlock the hidden depths of the universe.

    Unveiling the Faintest Sulphur Nebulae:

    With a precise 4.5nm bandpass (only 1.5% of the visible spectrum!), this filter isolates the Sulphur II (S-II) emission line at 671.6nm with unparalleled precision. This translates to superior signal-to-noise ratio, capturing even the faintest wisps of S-II-rich nebulae invisible to the naked eye.

    Impenetrable Darkness: The filter minimizes stray light and internal reflections, ensuring an exceptionally dark background, and allowing the delicate details of nebulae to truly shine.

    Maximum Signal, Minimal Compromise: Thanks to its advanced design, the filter boasts a maximum transmission exceeding 90% within 1nm of the center bandwidth for the S-II line. This means you capture the maximum possible signal while maintaining incredible contrast, even with long focal lengths or fast optical systems.

    Fast Optics Friendly: Worried about compatibility with your high-speed setup? Blue-shift data confirms that Antlia Edge filters can be used with systems as fast as f/3 with minimal loss of emission signal. This makes them ideal for telescopes equipped with Hyperstar or RASA configurations.

    Individually Tested, Guaranteed Quality: Each filter undergoes rigorous individual testing to ensure it meets the highest standards. The tight tolerance of the filter substrate guarantees a maximum deviation of only ±0.05 from specifications, making them parfocal. This means you can seamlessly switch between filters without refocusing, saving you valuable observation time.

    IR-Cut Not Required: The filter effectively blocks ultraviolet and infrared light, eliminating the need for a separate IR-cut filter. This simplifies your setup and reduces potential vignetting issues.


    A Word of Caution:

    Never, ever point your telescope equipped with this filter towards the sun. Doing so can cause irreversible eye damage. Always prioritize safety when exploring the wonders of the cosmos.



    Passing band
    4.5 nm (FWHM)
    Glass thickness
    2.0 mm ±0.05
    Optical flatness
    1/4 λ (wavefront)
    Bandpass transmission
    Off-band transmission
    OD5 @ 300-1050 nm
    Double-sided multilayer nano-coating
    Surface quality
    60/40 (in accordance with US military watch MIL-O-13830)
    Glass type
    Monolithic optical substrate (non glued)
    Filter size
    Mounted 1.25", 2", Unmounted 31mm, 36mm, 50mm round


    Antlia: Experts in Astronomy Filters

    Antlia Astronomy Filters are built by Deep-Sky Photography Enthusiasts for Enthusiasts of Astrophotography 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-SII4.5nmEDGE2

    Write Your Own Review
    You're reviewing:Antlia Edge SII 4.5nm Narrowband Filter - 2"
    Your Rating