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Baader f/2 Highspeed-Filterset H-alpha / OIII / SII

$649.00
SKU FHSS-1 (Baader #2459396)
Filter size

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Description
  • 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.

Baader's New f/2 Highspeed Narrowband Filters and Filtersets (1¼" and 2", H-alpha / O-III / S-II) are designed especially for the delicate requirements of extremely fast astrograph optics, such as Hyperstar, RASA, and ultra-fast instruments from TEC/AP/ASA/etc. Conventional narrowband filters cause a heavy loss in transmission due to the strong CWL-shift. In extreme cases the CWL even shifts 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. Also 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 the effective use of extremely fast optics for high contrast imaging of emission nebulae. Using these filters between f/1,8 and f/3,5 shows a dramatic improvement compared to any regular set of narrowband-filters.

Why Baader Planetarium Filters?

Specifications

1.25"

MANUFACTURER Baader Planetarium
SKU (#) 2459396
EAN CODE 4047825032157
WEIGHT (KG) 0.182
TRANSMISSION 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

2"

MANUFACTURER Baader Planetarium
SKU (#) 2459400
EAN CODE 4047825032164
WEIGHT (KG) 0.197
TRANSMISSION 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 2 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


31mm

MANUFACTURER Baader Planetarium
SKU (#) 2459384
EAN CODE 4047825035653
WEIGHT (KG) 0.182
TRANSMISSION 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 31 mm
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

50.4mm

MANUFACTURER Baader Planetarium
SKU (#) 2459388
WEIGHT (KG) 0.197
COLOUR Black
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50.4 mm
FILTER USAGE CCD, Deep Sky, f/2 Highspeed, H-alpha, O-III, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round

50x50mm

MANUFACTURER Baader Planetarium
SKU (#) 2459392
WEIGHT (KG) 0.197
COLOUR Black
TRANSMISSION RANGE multiple bands (see spectral image)
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm;502 nm;673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50 x 50 mm
FILTER USAGE CCD, Deep Sky, f/2 Highspeed, H-alpha, O-III, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Filter-Set
FILTER SHAPE round
Downloads

FAQ - Problems with filters can have the strangest causes

Halos - No Problem!