Baader H-alpha Ultra-Narrowband-Filters (3.5nm) – CMOS Optimized

Baader PlanetariumSKU: 2961325

Size: 1.25"
Sale price$414 CAD
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  • Baader H-alpha Ultra-Narrowband Filter – Premium Grade
  • 3.5 nm FWHM (to harmonize the exposure time with O-III / S-II), recommended for optical systems from f/10 to f/3.5
  • 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 black frontside outer rim
  • Optimized for modern CMOS cameras, but excellent for CCD camera technologies

We explicitly warn against observing the sun with a DeepSky 6.5 nm (equivalent to 65 Ångstrom) H-alpha narrowband filter, specialized solar chromosphere and prominence filters from SolarSpectrum start at 0.8 Ångstrom. Photographic experiments with a camera are theoretically possible, but by no means observe the sun with naked eyes – you endanger your eyesight!

This new generation of Baader CMOS-filters features:

CMOS-optimized Baader Filters


  • 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

    New CMOS-optimized Baader (Ultra-)Narrowband and Highspeed Filters


    Manufacturer Baader Planetarium
    SKU (#) 2961331
    EAN Code 4047825047601
    Net weight (kg) 0.09
    Colour Black
    Transmission Range H-alpha
    Filter Thickness (without cell) 3 mm
    HBW (Halfbandwidth) 3.5 nm
    CWL (Central Wavelength) 656,3 nm
    AR-Coating Reflex-Blocker™ hard coated, planeoptically polished
    Special Features CMOS-optimized with Life-Coat™
    Filter size 65 x 65 mm
    Filter Usage CMOS, CCD, H-alpha
    Filter mounted Unmounted
    Type of Filter Ultra-Narrowband
    Single or Set? Single Filter
    Filter shape square

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