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ManufacturerBaader Planetarium
SKU (#)2961673
EAN Code4047825104069
Net weight (kg)0.20
Suitable for f/ratio> f/3.4
Transmission RangeH-alpha / O-III / S-II
Filter Thickness (without cell)2 mm
HBW (Half bandwidth)3.5 nm (H-alpha) / 4 nm (O-III / S-II)
CWL (Central Wavelength)656,3 nm / 500,7 nm / 671,7 nm
AR-CoatingReflex-Blockerâ„¢ hard coated, Plane-optically polished
Special FeaturesCMOS-optimized with Life-Coatâ„¢\n
Filter size2 inch
Filter UsageCMOS, CCD, H-alpha, O-III, S-II
Filter mountedMounted (LPFC 6mm)
Type of FilterUltra-Narrowband
Single or Set?Filter-Set
Filter shaperound
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Baader 3.5 / 4nm Ultra-Narrowband-Filterset 2" – CMOS-optimized (H-alpha / O-III / S-II)

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Baader 3.5 / 4nm Ultra-Narrowband-Filterset 2" – CMOS-optimized (H-alpha / O-III / S-II)

Highlights

  • 2" x 2 mm Baader CMOS H-alpha / O-III / S-II Ultra-Narrowband Filter Set – Premium Grade – with 2" (M48) filter thread
  • 3.5 / 4 nm FWHM (to harmonize the exposure time from H-alpha with O-III / S-II), recommended for optical systems from > f/3.4
  • For highest contrast even at strongest light pollution, minimizes star size, emphasizes finest nebula detail – indispensable under Bortle 9/8/7/(6) skies
  • Reflex-Blockerâ„¢ hard coated and Plane-optically polished – with sealed coating edges (Life-Coatâ„¢)
  • 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
  • Mounted in Baader Low Profile Filter Cell (LPFC) – 6 mm height

Description

This new generation of Baader CMOS-filters features:

CMOS-optimized Baader Filters

 

  • Increased contrast
  • Ever more narrow band-passes

  • 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 remaining Par focal
  • Blackened edges all around, with filter-lead-side-indicator in the form of a black front side 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-Coatâ„¢: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

    • Specifications 

    Additional Information

    Manufacturer Baader Planetarium
    SKU (#) 2961673
    EAN Code 4047825104069
    Net weight (kg) 0.20
    Suitable for f/ratio > f/3.4
    Transmission Range H-alpha / O-III / S-II
    Filter Thickness (without cell) 2 mm
    HBW (Half bandwidth) 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-Blockerâ„¢ hard coated, Plane-optically polished
    Special Features CMOS-optimized with Life-Coatâ„¢
    Filter size 2 inch
    Filter Usage CMOS, CCD, H-alpha, O-III, S-II
    Filter mounted Mounted (LPFC 6mm)
    Type of Filter Ultra-Narrowband
    Single or Set? Filter-Set
    Filter shape round
    $282.02

    Original: $805.78

    -65%
    Baader 3.5 / 4nm Ultra-Narrowband-Filterset 2" – CMOS-optimized (H-alpha / O-III / S-II)—

    $805.78

    $282.02

    Product Information

    Shipping & Returns

    Description

    Highlights

    • 2" x 2 mm Baader CMOS H-alpha / O-III / S-II Ultra-Narrowband Filter Set – Premium Grade – with 2" (M48) filter thread
    • 3.5 / 4 nm FWHM (to harmonize the exposure time from H-alpha with O-III / S-II), recommended for optical systems from > f/3.4
    • For highest contrast even at strongest light pollution, minimizes star size, emphasizes finest nebula detail – indispensable under Bortle 9/8/7/(6) skies
    • Reflex-Blockerâ„¢ hard coated and Plane-optically polished – with sealed coating edges (Life-Coatâ„¢)
    • 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
    • Mounted in Baader Low Profile Filter Cell (LPFC) – 6 mm height

    Description

    This new generation of Baader CMOS-filters features:

    CMOS-optimized Baader Filters

     

  • Increased contrast
  • Ever more narrow band-passes

  • 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 remaining Par focal
  • Blackened edges all around, with filter-lead-side-indicator in the form of a black front side 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-Coatâ„¢: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

    • Specifications 

    Additional Information

    Manufacturer Baader Planetarium
    SKU (#) 2961673
    EAN Code 4047825104069
    Net weight (kg) 0.20
    Suitable for f/ratio > f/3.4
    Transmission Range H-alpha / O-III / S-II
    Filter Thickness (without cell) 2 mm
    HBW (Half bandwidth) 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-Blockerâ„¢ hard coated, Plane-optically polished
    Special Features CMOS-optimized with Life-Coatâ„¢
    Filter size 2 inch
    Filter Usage CMOS, CCD, H-alpha, O-III, S-II
    Filter mounted Mounted (LPFC 6mm)
    Type of Filter Ultra-Narrowband
    Single or Set? Filter-Set
    Filter shape round
    Baader 3.5 / 4nm Ultra-Narrowband-Filterset 2" – CMOS-optimized (H-alpha / O-III / S-II) | Telescopes