Focus Scientific

Astronomik Hydrogen Beta (H-beta) Narrowband 12nm CCD Filter (1.25\")

If you have to observe from light polluted sites (like most of us), imaging with narrowband emission line filters is the best way to take great images, as all kind of light pollution can be blocked very effectively!

The Astronomik H-beta filter is a narrow band emission-line filter for CCD photography. The filter lets the H-beta light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive. The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and DSLRs and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%. Another advantage of the 12nm filters is the better availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our H-alpha 6nm filter you often won’t find a usable guidestar. Together with the other three Astronomik emission-line filters you can do great color images even from very light polluted places! The filter has a built-in IR-blocker up to 1150nm. You don’t need an additional IR-blocker with this filter.

The Astronomik H-beta-CCD increases the contrast between objects, in this case between the H-beta emission line and the skyglow background. Our Astronomik H-beta-CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. The optimal aperture ratio for this filter is f/3.5 to f/6. The range of application extends from f/2.8 to f/15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of f/2 and more come into play.

This filter is not for solar observation.

Price does not include shipping from Germany, which is separate from the possible free shipping from us to you. You will be notified of these shipping charges prior to payment being taken.

Specifications

  • 98% transmission at 486nm (H-beta)
  • Full-Width-Half Maximum (FWHM): 12nm
  • Complete blocking from 350nm to 470nm and 500nm to 1100nm
  • parfocal with all Astronomik filters
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!
  • Thickness: 1mm
  • Not sensitive to moisture, scratch resistant, non-aging
  • High quality storage box
  • Made in Germany