Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, S-11) - Astronomy Plus

Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, SII)

H-alpha / 1.25"
$116.05
$116.05 $156.82
Skip to product information
Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, S-11) - Astronomy Plus
  • Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, S-11) - Astronomy Plus
  • Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, S-11) - Astronomy Plus
Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, SII)

Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, O-III, SII)

$116.05
$116.05 $156.82
Filter Usage
Filter Size

Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha, OIII, SII)

  • Baader H-alpha / O-III / S-II Narrowband Filter Set - Precision Grade
  • 6.5 nm FWHM, recommended for optical systems from f / 10 to f / 3.5
  • Reflex-Blocker ™ hard coated and planoptically 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

The new generation of Baader CMOS-optimized filters features:

  • CMOS-Optimized Baader Filter
  • 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

Technical Specifications

MANUFACTURER Baader Planetarium
SUITABLE FOR F/RATIO > f/3.4
TRANSMISSION RANGE H-alpha / O-III / S-II
FILTER THICKNESS (WITHOUT CELL)

2 mm Thickness = 1.25"/ 2" / 31mm / 36mm

3mm Thickness = 50.4mm / 50x50 / 65x65
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 Multiple
FILTER USAGE CMOS, CCD, H-alpha, O-III, S-II
FILTER MOUNTED Mounted (LPFC 6mm) / Unmounted 
TYPE OF FILTER Narrowband
SINGLE OR SET? Singles and Filter-Set
FILTER SHAPE round / square (depending on size)


In the Box

  • Baader 6.5nm Narrowband Filters

      Warranty & Manuals

      Baader Limited Lifetime Warranty

      You may also like