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Astronomik H-Beta 12 nm Visual Filter - 1.25" - HB-1

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SKU: ASF-HB-1

Astronomik H-Beta Visual Filter - 1.25"


  • This round visual filter is mounted in a 1.25" threaded cell
  • Lets H-Beta light emissions pass while blocking almost the complete spectral remainder including IR
  • This Astronomik H-Beta Filter has a 12 nm FWHM
  • Diffraction limited, this filter will not have a negative impact on your telescope's optical performance
  • Parfocal with all other Astronomik filters
  • Made in Germany, a country known for producing high quality optics!


This Astronomik H-Beta filter is designed for visual observation, especially when larger aperture instruments are being used. It allows H-Beta emission light to freely pass through while obstructing the rest of the spectrum to the degree that the eye becomes dark adapted. Using Astronomik's H-Beta Filter improves contrast so significantly that even viewing the Horse Head Nebula with 10" - 12" aperture telescopes, something heretofore unheard of, is now possible.

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 1:3 and higher aperture ratios are involved. Even when using a wide-angle eyepiece, the Astronomik H-Beta Filter permits the viewing of large objects in the eyepiece's entire field of view, not just in the eyepiece center. This filter is best suited for 8" (20 cm) or larger diameter optical tubes. Instruments with smaller apertures do not accumulate enough light for any worthwhile astronomical work. Astronomik's H-Beta visual filter features a high optical quality substrate that enables you to see razor-sharp stars identical those you would see using your normal telescope.

Like all filters from Astronomik, the 1.25" H-Beta 12 nm Visual Filter is parfocal with all other Astronomik filters. This filter offers complete resistance to scratching as well as to the effects of aging and high humidity. Astronomik filters are delivered in a durable, high-quality plastic storage case.