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Antlia OIII 7nm Prime Filter - 36mm
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Antlia OIII 7nm Prime Filter - 36mm

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SKU: ANT-OIII7P-36
$173.80
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Antlia OIII 7nm Prime Filter - Narrowband - 36mm Unmounted

The Antlia OIII Prime narrowband filter optimizes the FWHM (full width half maximum) to 7nm bandpass. The excellent optical coating characteristics found in the Antlia 3nm Pro series has been incorporated into the 7nm Prime narrowband filters, for high quality results that deliver superior SNR (signal to noise ratio) and better contrast in your images.

Antlia SII 7nm Prime filters are designed to deliver 90% transmittance at the CWL OIII 500.7nm lines, providing you with the maximum signal and well-defined nebulae structures. The out of band blocking specification is rated OD4 (0.01%) 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 7nm Prime filters are designed to minimize halos around bright stars. Antlia 7nm Prime filters can be used with nearly all systems as fast as f/2 with minimal loss in emission signal and meets the requirements of fast optics.

Antlia 7nm OIII Prime Filter Specifications

  • FWHM: 7nm
  • CWL: 500.7 nm
  • Peak Transmission: >90%
  • Blocking: 4 OD (0.01% out of band blocking) @ 300-1000nm
  • Filter Thickness: 2mm +/- 0.05 mm
  • Basic Substrate: Single, non-glued optical substrate
  • Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
  • Transmitted Wavefront: Lambda/4 or better
  • Parallelism: Less than 30 arcsec
  • Size: 36mm Unmounted

Antlia 7nm OIII Prime Filter Features

  • 90% transmittance at Central Wavelength OIII 500.7nm line
  • With wider FWHM, 7nm Prime narrowband filters can be used with fast optics of f/2 with minimal loss of signal
  • Steep spectral profile minimizes halos around bright stars
  • Narrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
  • Use in light polluted areas and dark sites
  • All Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light
  • Superior optical reliability reduces post image processing
  • This filter is not suited to deep sky objects that do not contain OIII emissions.