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Antlia 4.5nm H-alpha EDGE Filter

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The Antlia H-alpha EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD 5) on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR (signal to noise ratio) and better contrast in your images.

Antlia H-alpha 4.5nm EGDE filters are designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. Antlia guarantees T>90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics.

Constant development and improvement of their filters was a characteristic of this company. One of the main strength of the filters is the very high out of band blocking that stops unwanted light entering the optical system. This very high figure (ND5), combined with high transmittance and other band-pass characteristics of the target bandwidth and the affordable price created a range of filters with possibly the best price to performance ratio on the astro photography market.

Application and Performance:

  • High transmittance and narrow bandwidth to maximize contrast
  • Steep spectral profile minimizes halos around bright stars
  • A single substrate to eliminate internal reflections
  • Narrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants
  • Use in light polluted areas and dark sites
  • Extend imaging time when the moon is up
  • Antlia narrowband EDGE filters can be used down to f/3 systems with minimal loss of signal
  • Edge blackened to eliminate internal reflections from stray light
  • Superior optical reliability reduces post image processing
  • This filter is only effective for deep sky objects that contain H-alpha emissions

Technical Specifications:

  • Basic Substrate: Optical, Single / Non-glued substrate
  • Filter Thickness: 2mm+/-0.05mm for 1.25”, 2” mounted, Dia31mm and Dia36mm unmounted; 3mm+/-0.05mm for Dia50mm unmounted
  • FWHM (Full width at half maximum): 4.5nm
  • CWL (Central Wavelength): 656.3nm
  • Peak Transmission:>90%
  • Blocking: > 5 OD (out of band blocking) @ 300-1000nm
  • Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
  • Transmitted Wavefront: Lambda/4 or better.
  • Parallelism: less than 30 arcsec

Specifications: Antlia 4.5nm H-alpha EDGE Filter

What's in the Box

What's in the Box: Antlia 4.5nm H-alpha EDGE Filter

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