Astronomik H-Beta Filter - 1.25" Round Mounted

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Astronomik H-Beta Filter - 1.25" Round Mounted
Item # AK-HB-1
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  • The Astronomik H-Beta Filter for visual use is mounted in a 1.25" metal cell.
  • Hard coatings and superb optical materials make these H-Beta filters extremely resistant to scratches, aging, or the effects of high humidity. Astronomik guaranties the long life of these filters with a 5-Year Warranty.
  • With the Hydrogen-Beta line of the spectrum isolated, the Astronomik H-Beta filter can detect faint nebulae like the Horsehead, the Cocoon, or the California.
  • Due to the extremely narrow bandwidth of the H-beta filter, an 8" or larger telescope is recommended as too much light is blocked for visual use on smaller aperture telescopes.


Astronomik 1.25" H-Beta Visual Filter

The Astronomik H-beta is a filter for visual observation, in particular with instruments of larger aperture. It lets the light of the H-beta emission line pass nearly unhindered and blocks the remaining spectral range to the extent that the eye is dark adapted. By the use of the Astronomik H-beta filter, the contrast is increased so strongly, that even the observation of the Horse Head Nebulae with telescopes of 10" - 12" reaches the realm of the possible.

The optimal aperture ratio for the use of the filter is 1:4 to 1:6. The Astronomik H-beta filter will allow you to view large objects, in the whole field of view of the eyepiece, even when using wide-angle eyepieces - not only in the center of the eyepiece. This filter should be used on telescopes with a diameter of 8" (200mm) or larger. Smaller instruments do not gather enough light for meaningful and satisfying astronomical work. Due to the high optical quality of the Astronomik H-beta filter substrate you will see the same needle-sharp stars as you would from your regular telescope.

Astronomik 1.25" H-Beta Visual Filter Features

  • Transmission of nearly 100% of the H-beta line complete blocking of all disturbing wavelengths
  • Main operational use: Hydrogen Nebulae No moisture (humidity) sensitivity, no aging, and totally scratch-proof
  • Excellent carrier material - substrate is optically polished. The optical performance (resolution & contrast) of your telescope is not reduced in any way by the filter.
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Completely resistant against high humidity, scratches and aging effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!
  • Astronomik filters are delivered in a high-quality, long lasting, filter box
Additional Information

Additional Information

Manufacturer Astronomik
Type of Filter H-Beta
Filter Usage Imaging
Single or Set? Single Filter
Filter Size 1.25"
Filter Shape Round
Filter Mounted? Mounted
Warranty 10 Year Warranty
Peak Transmission Nearly 100% at H-alpha
Included Items

Included Items

  • Astronomik 1.25" H-Beta Visual Filter
  • Protective Plastic Case
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