Baader f/2 Highspeed-Filter set H-alpha / OIII / SII - RD50

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Baader f/2 Highspeed-Filter set H-alpha / OIII / SII - RD50

This f/2 High-speed Filter Set consists of 3 Round 50 mm Filters (Ø 50.4 mm):

  • H-alpha
  • Oiii
  • Sii

These High-speed Narrowband Filters 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 the use of 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.

 Image Note: The image shows several sizes, this product is only for the 50.4 mm Round filters.


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