Baader Planetarium Accessory Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)
Baader Planetarium Accessory Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)
Baader Planetarium Accessory Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)
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Baader Planetarium Accessory Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)Baader Planetarium Accessory Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)Baader Planetarium Accessory Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)

Baader 3.5 / 4nm Ultra-Narrowband-Filterset 31mm – CMOS-optimized (H-alpha / O-III / S-II)

Baader PlanetariumSKU: 2961671
Price:
$1,210 CAD
Stock:
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Description

Highlights 

  • 31 mm x 2 mm Baader CMOS H-alpha / O-III / S-II Ultra-Narrowband Filter Set – Premium Grade

  • 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-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:


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

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