- 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