Baader 1.25" f/2 Highspeed S-II Filter w/ LPFC

Baader 1.25" f/2 Highspeed S-II Filter w/ LPFC
$219.00
Item # BA-FSIIHS-1
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Waiting List

  • This Baader 1.25" f/2 Highspeed S-II Filter was made specifically for the sensitive requirements of exceptionally fast astrograph optics.
  • This S-II filter is still able to produce peak contrast despite the typical line broadening seen with fast optical trains.
  • This Baader 1.25" f/2 Highspeed S-II Filter permits the effective use of tremendously fast optics for high contrast imaging of emission nebulae for the first time.
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Baader Planetarium f/2 Highspeed S-II Filter w/ LPFC


Baader's new f/2 Highspeed Narrowband filters are made specifically for the sensitive requirements of exceptionally fast astrograph optics, such as Hyperstar, RASA, and extremely fast instruments from TEC, AP, ASA, etc. Ordinary narrowband filters generate a heavy loss in transmission because of the strong CWL (center-wavelength) shift. In severe circumstances, the CWL even shifts out of the FWHM (full width half maximum).

As a result, this filter has a CWL-preshift which flawlessly matches f/2 to f/3. Furthermore, the FWHM is enhanced. Despite the typical line broadening with such fast optical trains, this filter is still able to produce peak contrast. This filter permits the effective use of tremendously fast optics for maximum contrast imaging of emission nebulae for the first time. Compared with regular narrowband filters, using this highspeed h-alpha filter between f/1.8 and f/3.5 will exhibit drastic improvement.

Baader Planetarium Product Number: FSIIHS-1

Additional Information

Additional Information

SKU BA-FSIIHS-1
Manufacturer Baader
Type of Filter Sulfur II
Filter Usage Imaging
Single or Set? Single Filter
Filter Size 1.25"
Filter Shape Round
Filter Mounted? Mounted
Warranty 1 Year Warranty
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Included Items

Included Items

  • Baader Planetarium 1.25" f/2 Highspeed Narrowband S-II Filter w/ LPFC
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