Baader F/2 HighspeedFilter Set 1.25 " H-ALPHA / OIII / SIII 2459396

Code: 2459396

Baader F/2 HighspeedFilter Set 1.25 " H-ALPHA / OIII / SIII 2459396

  • Narrow band f / 2 high-speed filter (H-alpha / O III / S II) in LPFC version for photography with extremely fast astro graphs
  • Specially designed for the special filter requirements when used with high-open optics, especially Celestron Hyperstar or RASA. Conventional narrow-band filters suffer from a high transmission loss due to the central wavelength (ZWL) displacement when used at high-opened optics, in extreme cases the ZWL may even be outside of the half-width (HWB). The ZWL was therefore adapted for f / 2, the layer system was optimized for maximum freedom of reflection for the extremely wide beam of light.
  • The HWB of these filters is optimized to f / 1.8 to f / 3.5 to deliver the highest contrast despite the high line broadening of such holes.
  • Only with these filters can extremely fast optics be used effectively in fog photography. Between f / 1.8 and f / 3.5, these filters provide a significant improvement.

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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.


Tranmission Range: multiple bands (see spectral image)
Filter Thickness (Without Cell): 2 mm
CWL (Central Wavelength): 656,3 nm;502 nm;673 nm
AR-Coating: dielectrically coated, planeoptically polished
Filter Size: 1 25 inch
Filter Usage: CCD, Deep Sky, f/2 Highspeed, H-alpha, O-III, S-II
Filter Mounted: Mounted (LPFC 6mm)
Type Of Filter: Narrowband
Single Or Set?: Filter-Set
Filter Shape: round

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