Baader f/2 S-II High-Speed Filter

£265.00
SKU 2459391

Availability: Anticipated Dispatch in 7-10 days

  • Baader f/2 S-II High-speed narrowband Filter
  • For use in fast optics such as Celestron RASA and Starizona Hyperstar astrographs
  • Suited for astrographs between f/1.8 to f/3.5
Description

These Baader S-II High-speed f/2 narrowband filters are for use in fast optical systems such as Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) and Starizona's Hyperstar systems. The use of conventional narrowband filters cause a heavy loss in transmission due to the strong centre wavelength (CWL) shift. In extreme (very fast) cases the CWL shifts out of the filter's full width half maximum (FWHM) transmission. Therefore these filters have a CWL-preshift which matches f/2 to f/3 optics perfectly.

In spite of the typical line broadening with such fast optical trains these filters 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.

Specifications
WEIGHT (KG) 0.06kg
COLOUR S-II
TRANSMISSION RANGE S-II
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 673nm
AR-COATING dielectrically coated, plane-optically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER USAGE CCD, Deep Sky, S-II
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter