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Baader f/2 Narrowband Highspeed-Filterset 2" - Set of 3 Filters H-alpha, OIII and SII

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in In stock (2)
0.50 kg
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including VAT 20.00 % ( £98.17 )


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  • f/2 Highspeed Filterset consisting of 3 Filter: H-alpha, O III and S II. Highspeed Narrowband Filter are designed especially for the delicate requirements of extremely fast astrograph optics, in particular Hyperstar and RASA
  • Conventional narrowband filters cause a heavy loss in transmission due to the strong CWL-shift. In extreme cases the CWL even does shift out of the FWHM (CWL= Center-wavelength / FWHM= full width half maximum). Therefore these filters have a CWL-preshift which matches f/2 to f/3 perfectly.
  • The FWHM is optimized. In spite of the typical line broadening with such fast optical trains they are able to deliver maximum contrast.
  • For the first time these filters allow to use fast optics really effectively with high contrast emission nebulae imaging. Using these filters between f/1,8 and f/3,5 shows a dramatic improvement compared to any regular set of narrowband-filters.

About production delays of Baader Highspeed Filters

We have received the following question on our Narrowband (and f/2 Highspeed) filters: I understand that narrow-band filters suffer shifts of the passband for light rays that come in at an angle. Is that why they are good to a certain f-ratio and why you offer different filters for fast optics (how do they work? are they actually de-tuned to have the correct passpand at a different average angle?)? I would like to ask whether this additionally depends on the field-of-view of the optics? I would expect that since the angle should be larger for wide field imaging at the same f-ratio? So are all of the filter ment to be used with telescopes or can they also be used with shorter focal length camera lenses, for example? Since this question is of particular interest for many other people, we would like to answer publicly and take this opportunity to comment also on the very long delay of our 2" f/2 Highspeed filters. Please see our answer below: In general what you assume is very true - but - "the devil is in the detail". For an aperture ratio of f/2, the filter design-CWL would require to being given some shift...

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