Baader f/2 Highspeed-Filters/ SII (Specify Size)

$199.00
Article number: FSIIHS-XX
Availability: Order Now!
Delivery time: Ships from our warehouse in 7-10 days
  • Narrowband f/2 Highspeed Filters 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.

1.25"

MANUFACTURER Baader Planetarium
SKU (#) 2459393
EAN CODE 4047825028426
WEIGHT (KG) 0.059
COLOUR H-alpha
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 1 25 inch
FILTER USAGE CCD, f/2 Highspeed, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459394
EAN CODE 4047825028440
WEIGHT (KG) 0.059
COLOUR O-III
TRANSMISSION RANGE O-III
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 502 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 1 25 inch
FILTER USAGE CCD, f/2 Highspeed, O-III
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459395
EAN CODE 4047825028464
WEIGHT (KG) 0.059
COLOUR S-II
TRANSMISSION RANGE S-II
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 1 25 inch
FILTER USAGE CCD, f/2 Highspeed, S-II
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

2"

MANUFACTURER Baader Planetarium
SKU (#) 2459397
EAN CODE 4047825028433
WEIGHT (KG) 0.065
COLOUR H-alpha
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 2 inch
FILTER USAGE CCD, f/2 Highspeed, H-alpha
FILTER MOUNTED Mounted (LPFC 6mm)
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459382
EAN CODE 4047825035639
WEIGHT (KG) 0.059
COLOUR O-III
TRANSMISSION RANGE O-III
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 502 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 31 mm
FILTER USAGE CCD, f/2 Highspeed, O-III
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459383
EAN CODE 4047825035646
WEIGHT (KG) 0.059
COLOUR S-II
TRANSMISSION RANGE S-II
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 31 mm
FILTER USAGE CCD, f/2 Highspeed, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE

round


31mm

MANUFACTURER Baader Planetarium
SKU (#) 2459381
EAN CODE 4047825035622
WEIGHT (KG) 0.059
COLOUR H-alpha
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 31 mm
FILTER USAGE CCD, f/2 Highspeed, H-alpha
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459382
EAN CODE 4047825035639
WEIGHT (KG) 0.059
COLOUR O-III
TRANSMISSION RANGE O-III
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 502 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 31 mm
FILTER USAGE CCD, f/2 Highspeed, O-III
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459383
EAN CODE 4047825035646
WEIGHT (KG) 0.059
COLOUR S-II
TRANSMISSION RANGE S-II
FILTER THICKNESS (WITHOUT CELL) 2 mm
CWL (CENTRAL WAVELENGTH) 673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum Kontrast for fast Astrographs
FILTER SIZE 31 mm
FILTER USAGE CCD, f/2 Highspeed, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

50.4mm

MANUFACTURER Baader Planetarium
SKU (#) 2459385
WEIGHT (KG) 0.059
COLOUR H-alpha
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 656,3 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50.4 mm
FILTER USAGE CCD, Deep Sky, H-alpha
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459386
WEIGHT (KG) 0.059
COLOUR O-III
TRANSMISSION RANGE O-III
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 502 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50.4 mm
FILTER USAGE CCD, f/2 Highspeed, O-III
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE

round

 

MANUFACTURER Baader Planetarium
SKU (#) 2459387
WEIGHT (KG) 0.059
COLOUR S-II
TRANSMISSION RANGE S-II
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50.4 mm
FILTER USAGE CCD, f/2 Highspeed, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round

50x50mm

MANUFACTURER Baader Planetarium
SKU (#) 2459389
WEIGHT (KG) 0.059
COLOUR H-alpha
TRANSMISSION RANGE H-alpha
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 656,3 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, H-alpha
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round
 
MANUFACTURER Baader Planetarium
SKU (#) 2459390
WEIGHT (KG) 0.059
COLOUR O-III
TRANSMISSION RANGE O-III
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 502 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50 x 50 mm
FILTER USAGE CCD, f/2 Highspeed, O-III
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round
 
MANUFACTURER Baader Planetarium
SKU (#) 2459391
WEIGHT (KG) 0.059
COLOUR S-II
TRANSMISSION RANGE S-II
FILTER THICKNESS (WITHOUT CELL) 3 mm
CWL (CENTRAL WAVELENGTH) 673 nm
AR-COATING dielectrically coated, planeoptically polished
SPECIAL FEATURES Maximum contrast for fast Astrographs
FILTER SIZE 50 x 50 mm
FILTER USAGE CCD, f/2 Highspeed, S-II
FILTER MOUNTED Unmounted
TYPE OF FILTER Narrowband
SINGLE OR SET? Single Filter
FILTER SHAPE round
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