Baader f/2 Highspeed-Filterset H-alpha / OIII / SII
- f/2 Highspeed Filterset consisting of 3 Filter: H-alpha, O III, and S II. Highspeed Narrowband Filter is 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 us 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.
NGC 1893 – Tadpole Nebula, taken by Andreas Bringmann with Prototypes of Baader f/2 Highspeed-Filterset
Including three filters:
- H-alpha 7nm Highspeed
- OIII 8.5nm Highspeed
- SII 8nm Highspeed
|FILTER SIZE||1 25 inch||2 inch|
|MANUFACTURER||Baader Planetarium||Baader Planetarium|
|TRANSMISSION RANGE||multiple bands (see spectral image)||multiple bands (see spectral image)|
|FILTER THICKNESS (WITHOUT CELL)||2 mm||2 mm|
|CWL (CENTRAL WAVELENGTH)||656,3 nm; 502 nm; 673 nm||656,3 nm; 502 nm; 673 nm|
|AR-COATING||dielectrically coated, planeoptically polished||dielectrically coated, planeoptically polished|
|FILTER USAGE||CCD, Deep Sky, f/2 Highspeed, H-alpha, O-III, S-II||CCD, Deep Sky, f/2 Highspeed, H-alpha, O-III, S-II|
|FILTER MOUNTED||Mounted (LPFC 6mm)||Mounted (LPFC 6mm)|
|TYPE OF FILTER||Narrowband||Narrowband|
|SINGLE OR SET?||Filter-Set||Filter-Set|
Available in other sizes and formats. If you do not find the size you want, contact us at firstname.lastname@example.org.