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Baader f/2 High-Speed Filter Sets

£435.00
SKU 2459396

Availability: Immediate Dispatch

  • Baader f/2 Highspeed Filterset
  • Consisting of H-alpha, O III and S II f/2 filters
  • Available in 1.25", 2", 31mm, 50.4mm round and 50x50mm square sizes
  • Using these filters between f/1,8 and f/3,5 shows a dramatic improvement compared to any regular set of narrowband-filters.
Description

Highspeed Narrowband Filter are designed especially for the delicate requirements of extremely fast astrograph optics, in particular Hyperstar and Celestron RASA telescopes. These sets are available in the folowing sizes:

  • 1.25" mounted
  • 2" mounted
  • 31mm unmounted
  • 50.4mm unmounted round
  • 50x50mm square unmounted

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.

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.

Specifications
MANUFACTURER Baader Planetarium
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 2 mm (3mm 50x4/50x50mm)
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
FILTER SIZE 1.25", 2", 31 mm, 50.4mm round, 50x50mm square
FILTER USAGE CCD, Deep Sky, f/2 Highspeed, H-alpha, O-III, S-II
FILTER MOUNTED Mounted (LPFC 6mm) / unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round & square