Baader 3.5 / 4nm f/2 Ultra-Highspeed-Filterset 50x50mm – CMOS-optimized (H-alpha / O-III / S-II)

Baader PlanetariumSKU: 2961685

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Sale price$1,897 CAD
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Description

Highlights 

  • 50 x 50 mm x 3 mm Baader CMOS H-alpha / O-III / S-II f/2 Ultra-Highspeed Filter Set – Premium Grade
  • 3.5 / 4 nm FWHM (to harmonize the exposure time from H-alpha with O-III / S-II), recommended for extremely fast optical systems from < f/2.3
  • Specially designed for the special filter requirements when used with extremely fast f/2 optics like the Celestron RASA astrographs
  • For highest contrast even at strongest light pollution, minimizes star size, emphasizes finest nebula detail – indispensable under Bortle 9/8/7/(6) skies
  • Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
  • Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim
  • Optimized for modern CMOS cameras, but likewise excellent for CCD camera technologies 

Description 

 This new generation of Baader CMOS-filters features:

  • Increased contrast
  • Ever more narrow passbands
  • Reflex-Blocker coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
  • FWHM on each filter category carefully designed to allow for 1:1:1 exposures,

    matched for typical CMOS quantum efficiency and s/n ratio
  • Identical filter thickness to existing standards, with utmost care for parfocality
  • Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
  • Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
  • Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
  •  

    Specifications

    Manufacturer Baader Planetarium
    SKU (#) 2961685
    EAN Code 4047825104151
    Net weight (kg) 0.22
    Suitable for f/ratio < f/2.3
    Transmission Range H-alpha / O-III / S-II
    Filter Thickness (without cell) 3 mm
    HBW (Halfbandwidth) 3.5 nm (H-alpha) / 4 nm (O-III / S-II)
    CWL (Central Wavelength) 656,3 nm / 500,7 nm / 671,7 nm
    AR-Coating Reflex-Blocker™ hard coated, planeoptically polished
    Special Features CMOS-optimized with Life-Coat™
    Filter size 50 x 50 mm
    Filter Usage CMOS, CCD, H-alpha, O-III, S-II
    Filter mounted Unmounted
    Type of Filter f/2 Ultra-Highspeed
    Single or Set? Filter-Set
    Filter shape square

    Additional Resources

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