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ANTLIA PRO Ultra Narrowband 3nm OIII Filter - 31mm Unmounted

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including VAT 20.00 % ( £55.17 )

ANTLIA PRO Ultra Narrowband 3nm OIII Filter - 31mm Unmounted (glass only)

Now these Antlia filters got even better! 3nm bandwidth instead of 3.5nm! 

Description of the new PRO 3nm filters is under construction!

The out of band blocking specification of the new OIII Pro version is rated to OD5 (0.001%) which delivers an excellent SNR (signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography! The 3nm Pro filters are designed to minimize halos around bright stars.  

The Antlia OIII 3.0nm filter is suitable for imaging Oxigen III emissions from nebulae, planetary nebulae and supernova remnants.
The 3.0nm bandwidth delivers a high transmission at a center wavelength of 500.7nm. The extreme narrowness in bandwidth enables astro-imaging from heavily light polluted locations and delivers improved contrast at darker sites. The filter effectively suppresses interference from other wavelengths, especially artificial mercury and sodium lamps.
Antlia narrowband filters are designed to bring out the faintest features in nebulosity by reducing the unwanted background frequencies. The narrower the filter, the better. Our OIII filter is designed to deliver 90 % transmission at the 500.7nm line. The out of band blocking specification is rated OD3 (0.1%) which delivers an excellent signal to noise ratio and effective cut off rate to minimize interference from other wavelengths.
A sharp cut off rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia Ha filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the OIII signal. The sharp cut-off also minimizes the effect of halos around bright stars.
In the production process, we use very strict quality control standards. Each filter is individually tested and scanned to ensure that the product meets our high-performance parameters. Our exacting attention to tolerances requires each substrate to have a uniform thickness that achieves no more + -0.05mm deviation from specification.

Application and Performance:

  • Ultra-narrow 3.0 nm bandwidths, designed for astronomy imaging in both light polluted areas and at dark sites;
  • Suitable for imaging of OIII emission in nebulae, planetary nebulae and supernova remnants;
  • With the Ha, SII, OIII set of filters you are able to process your images to achieve the impressive Hubble color palette;
  • With the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Color process;
  • High transmission of typically 90% and sharp cut-off delivers an excellent boost in contrast for OIII emitting objects;
  • All Antlia Narrowband filters are edge blackened to minimize interference from stray light;
  • This filter is not suited to deep sky objects that do not contain OIII emissions. It can be used to image OIII regions in galaxies and such images can be combined into LRGB images to better highlight the Ha emitting regions of galaxies.

Technical Data:

  • Schott optical substrate
    • 1.25”, 2” mounted, 31mm,36mm dia (2mm+/-0.05mm)
    • 50mm dia,50*50mm,65*65mm square (3mm+/-0.05mm)
    • Surface Quality: 60/40 (Refer to MIL-O-13830)
    • 2 sides fine-optically polished to ensure accurate 1/4 wavefront
    • 30 arcsec parallelism
  • Center-Wavelength of Antlia OIII 3.0nm filter: 500.7nm
  • OIII 500.7nm T>90%, 90 % transmission at OIII line at 500.7nm
  • OD3(0.1%)@ 300-1000nm
  • Both sides with multi-layer anti-reflection coating
  • Single / Non-glued substrate

Filter Cell (specifications for cell mounted filters only):

  • 1.25” (M26*0.6),2” (M48*0.75)
  • Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
  • Black Anodized Finish
  • Non-Fading Laser Engraving

Available Sizes:

  • Mounted: 1.25” & 2” (2mm thickness)
  • Unmounted:Dia 31mm,Dia 36mm (2mm thickness)
  • Unmounted:Dia 50mm (3mm thickness)
  • Unmounted:50*50mm,65*65 square (3mm thickness)

Not Recommended:

  • Solar Observing and imaging
  • Visual observation
      Serious eye damage will result if you fail to observe the warning.


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