The new Antlia ALP-T H-alpha and O-III Dual Band filter is specifically designed for astrophotography with colour DSLR, CMOS or CCD cameras in areas with heavy light pollution. Its two 5nm passing bands are exceptional at isolating nebulae emissions in H-Alpha and OIII. The optical density of 4.5 suppresses unwanted wavelengths from light pollution, moonlight and skyglow, resulting in superior signal-to-noise ratio and better contrast.

The 36mm unmounted variant comes with a handy mounting adapter so you can use it with 2″ filter drawers and accessories!

Like all Antlia filters, the Golden Dual Band filter has excellent halo suppression, making imaging of targets surrounded by bright stars such as the Horsehead Nebula pain-free.

  • It blocks the artificial light from mercury vapour lamps, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
  • Maximum transmission of the main nebula emission lines at OIII (500.7nm) is >82% and H-alpha (656.3nm) is >90%. Good signal is still achievable with optics as fast as f/3.
  • Two transmission bands with a bandpass of 5nm. OD4.5 @ 300-1100nm.
  • Ideal for urban areas with extreme light pollution.
  • It incorporates an IR/UV-Cut filter that is necessary in astrophotography, especially for astronomy cameras that are sensitive to the infrared radiation.
  • Ultra-thin filter cell to maximise the compatibility with most filter drawers.
  • Ideal flat-top and moderate bandpass reduces spectrum down shifts.
  • Good performance at focal ratios slower than f/3.

To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter. 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.

Passing band 5 nm (FWHM)
Glass thickness 2.0 mm ±0.05
Optical flatness 1/4 λ (wavefront)
Bandpass transmission H-a >90%, OIII >82%
Off-band transmission OD4.5 @ 300-1100 nm
Coating Double-sided multilayer nano-coating
Surface quality 60/40 (in accordance with US military watch MIL-O-13830)
Parallelism 30″
SKU
2″ – AN-ALP-T, 36mm – AN-ALP-T-36

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Antlia ALP-T Ha & OIII Dual Band Filter

SKU: N/A

$499.00$649.00

Filter Size: 2" Mounted, 36mm Unmounted
✅ Fast Shipping & Tracking
✅ Stocked in Melbourne, Australia
✅ Expert Advice
✅ Lifetime Technical Support

    Need Expert Advice?

    Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

    Enquire now or call us (03) 9042 2293

    Antlia ALP-T Ha & OIII Dual Band Filter

    SKU: N/A

    $499.00$649.00

    Filter Size: 2" Mounted, 36mm Unmounted

    The new Antlia ALP-T H-alpha and O-III Dual Band filter is specifically designed for astrophotography with colour DSLR, CMOS or CCD cameras in areas with heavy light pollution. Its two 5nm passing bands are exceptional at isolating nebulae emissions in H-Alpha and OIII. The optical density of 4.5 suppresses unwanted wavelengths from light pollution, moonlight and skyglow, resulting in superior signal-to-noise ratio and better contrast.

    The 36mm unmounted variant comes with a handy mounting adapter so you can use it with 2″ filter drawers and accessories!

    Like all Antlia filters, the Golden Dual Band filter has excellent halo suppression, making imaging of targets surrounded by bright stars such as the Horsehead Nebula pain-free.

    • It blocks the artificial light from mercury vapour lamps, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
    • Maximum transmission of the main nebula emission lines at OIII (500.7nm) is >82% and H-alpha (656.3nm) is >90%. Good signal is still achievable with optics as fast as f/3.
    • Two transmission bands with a bandpass of 5nm. OD4.5 @ 300-1100nm.
    • Ideal for urban areas with extreme light pollution.
    • It incorporates an IR/UV-Cut filter that is necessary in astrophotography, especially for astronomy cameras that are sensitive to the infrared radiation.
    • Ultra-thin filter cell to maximise the compatibility with most filter drawers.
    • Ideal flat-top and moderate bandpass reduces spectrum down shifts.
    • Good performance at focal ratios slower than f/3.

    To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter. 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.

    Passing band 5 nm (FWHM)
    Glass thickness 2.0 mm ±0.05
    Optical flatness 1/4 λ (wavefront)
    Bandpass transmission H-a >90%, OIII >82%
    Off-band transmission OD4.5 @ 300-1100 nm
    Coating Double-sided multilayer nano-coating
    Surface quality 60/40 (in accordance with US military watch MIL-O-13830)
    Parallelism 30″
    SKU
    2″ – AN-ALP-T, 36mm – AN-ALP-T-36

    Reviews

    There are no reviews yet.

    Be the first to review “Antlia ALP-T Ha & OIII Dual Band Filter”

    Your email address will not be published. Required fields are marked *

      Need Expert Advice?

      Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

      Enquire now or call us (03) 9042 2293