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Astronomik H-Beta Visual Filter - SC Rear Cell - HB-SCT

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SKU: ASF-HB-SCT

Astronomik H-Beta Visual Filter - SC Rear Cell

  • Designed for visual applications, this filter comes mounted in a round sct threaded cell
  • Allows emissions of H-Beta light to be transmitted while blocking nearly the entire rest of the spectrum including IR
  • Approximately 12 nm full width at half maximum (FWHM) bandwidth
  • 1 mm thick glass
  • Parfocal with all other filters offered by Astronomik
  • Boasts high quality German-designed optics!


Made for visual use, especially when larger aperture telescopes are involved, this Astronomik filter passes H-Beta emission light through while blocking the remainder of the spectrum to the point that the eye is able to adapt to the dark. This H-Beta filter offers such a substantial enhancement in contrast that even something as inconceivable as observing the Horsehead Nebula with 10" or 12" aperture telescopes is now plausible.

The ideal aperture ratio for the use of this filter is 1:4.5 to 1:6. Range of application spans from 1:3.5 to 1:15. Transmission reductions and chromatic distortions, which can be a nuisance with other filters, only arise with Astronomik filters when exceptionally fast focal ratios are involved. Since telescopes with apertures smaller than 8" are not able to collect enough light for any kind of productive astronomical work, this H-Beta filter is best suited for use with larger diameter optical tubes. Artifical emissions from sources like sodium and mercury-vapor streetlights, common light pollution culprits, are completely blocked with this 12 nm H-Beta filter. The contrast between objects in the H-Beta emission line and the background sky is enhanced.

As with all Astronomik filters, the 2" H-Beta Filter is parfocal with all other filters produced by Astronomik. It offers complete suppression of all undesired visible light and IR spectral wavelengths. Provides total resistance against the impacts of scratching, aging, and high humidity. All Astronomik filters arrive in a durable plastic storage container of superior quality.