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Astronomik H-beta Filter

Astronomik H-beta Filter
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Our Price:  £83.00(Inc. 20% VAT)
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Filter Size:  


Model:  AF130
Brand:  Astronomik

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In stock, immediate despatch



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. The contrast is so strongly increased by the use of the Astronomik Hbeta filter with hydrogen nebulae that even the observation of the Horse Head Nebulae with telescopes of 10" - 12" moves into the realm of the possible.

Main use
The optimal aperture ratio for the use of the filter is 1:4,5 to 1:6. The range of application extends from 1:3.5 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, are only apparent with the Astronomik filters when extremely fast aperture ratios of 1:3 and higher are used. 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 " (20cm) 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.

Suitability

  • Visual observation (dark skies): Verry good, but only suitable for a few objects
  • Visual observation (urban skies): Unsuitable
  • Film photography: It depends, very long exposure time
  • CCD photography: Good, when used with an additional IR-block-filter
  • DSLR photography (original): Verry good, but only suitable for a few objects
  • DSLR photography (astro modified): Verry good, but only suitable for a few objects
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Unsuitable
Technical Data
  • 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

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