Antlia OIII 2.8nm Narrowband Filter - 36mm

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This 36mm filter features an unprecedented FWHM (full width half maximum) of 2.8nm ± 0.5/-0.1nm, that isolates the Oxygen-III (OIII) emission lines, revealing hidden details within certain nebulae.

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    Constructed from resilient quartz glass, the Antlia filter boasts an exceptionally low thermal expansion coefficient. This translates to consistent performance even in demanding conditions, making it ideal for astrophotographers venturing beyond familiar grounds. The meticulously controlled coating process ensures outstanding durability, allowing the filter to withstand the rigors of travel and harsh environments without compromising its integrity.

    Compared to its predecessor, the 3nm Pro series, the 2.8nm Ultra series achieves a significant increase in transmission, with Ha/SII exceeding 97% and OIII surpassing 95%. This translates to a dramatic improvement in signal-to-noise ratio, allowing you to capture the faintest wisps of nebulosity with breathtaking clarity. To further enhance the image and suppress unwanted light, Antlia employs cutting-edge edge-blackening technology, minimizing the impact of stray light and internal reflections, resulting in stunningly sharp and contrasty images.

    The OIII line transmission peaks at a remarkable 95% within 1nm of the center bandwidth, boasting a flat-top spectral profile that minimizes transmission loss due to central wavelength (CWL) shifting. This meticulous engineering ensures you capture the full potential of the OIII emission lines. For optimal results, this filter is recommended for telescopes with a focal ratio of ≥ f/3.5.

    Each Antlia filter undergoes rigorous individual scanning to guarantee the highest quality standards. The included test sheets are not generic representations, but the actual measured spectra and transmission data for your specific filter, providing you with unparalleled transparency and confidence in your equipment. Additionally, the tight tolerance of the substrate ensures a maximum deviation of ± 0.05 from specifications, crucial for maintaining parfocality with other filters in your astrophotography setup.

    This filter effectively cuts off unwanted ultraviolet and infrared light, eliminating the need for a separate UV/IR-cut filter, simplifying your astrophotography setup. The quartz glass substrate and enhanced coatings further enhance the filter's resistance to fractures and scratches, ensuring it can withstand the rigors of travel and frequent use.



    Passing band 2.8 nm +0.5/-0.1 nm (FWHM)
    Glass thickness 2.0 mm ±0.05
    Optical flatness 1/4 λ (wavefront)
    Bandpass transmission 95%
    Off-band transmission OD5 @ 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 Monolithic optical substrate (non glued)
    Filter size Unmounted 36 mm
    SKU AN-H-OIII2.8

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


    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-H-OIII2.8

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