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H-Beta Filter
Kson H-Beat Filter
 
RRP AU$69.00
was $89
The 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 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.

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 filters when extremely fast aperture ratios of 1:3 and higher are used. The 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.

Suitability
  • Visual observation (dark skies): Vary good, but only suitable for a few objects
  • Visual observation (urban skies): Unsuitable
  • Film photography: It depends, very long exposure time
  • DSLR photography (original): Very good, but only suitable for a few objects
  • DSLR photography (astro modified): Very good, but only suitable for a few objects
  • DSLR photography (MC modified): Good, when used with an additional IR-block-filter
  • Web cam / Video (Planets): Unsuitable
  • Web cam / 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 Astronomic 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!


The filter is available in the following sizes:
  • Mounted filter in 1,25" cell (M28,5mm x 0,5mm),
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