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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
Transmission curve
Technical Data:
| FILTER SIZE | 1 25 inch | 2 inch |
|---|---|---|
| MANUFACTURER | Baader Planetarium | Baader Planetarium |
| SKU (#) | 2459396 | 2459400 |
| EAN CODE | 4047825032157 | 4047825032164 |
| WEIGHT (KG) | 0.182 | 0.197 |
| TRANSMISSION RANGE | multiple bands (see spectral image) | multiple bands (see spectral image) |
| FILTER THICKNESS (WITHOUT CELL) | 2 mm | 2 mm |
| HBW (HALFBANDWIDTH) | 7nm | 7nm |
| 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 |
| FILTER SHAPE | round | round |
Available in other sizes and formats. If you do not find the size you want, contact us at info@lunatico.es.
