Baader 3.5 / 4nm f/2 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II) - Astronomy Plus

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

H-alpha (3.5nm) / 1.25"
$190.00
$190.00 $311.47
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Baader 3.5 / 4nm f/2 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II) - Astronomy Plus
  • Baader 3.5 / 4nm f/2 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II) - Astronomy Plus
  • Baader 3.5 / 4nm f/2 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II) - Astronomy Plus
Baader 3.5 / 4nm f/2 Ultra-Highspeed Filters – CMOS-optimized (H-alpha / O-III / S-II)

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

$190.00
$190.00 $311.47
Title

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

Baader has released a whitepaper guiding you how to select the best filter for your telescope system, and why this is important in relation to "PRESHIFT" to stay "on band".

Now with 47.4 mm unmounted for use with FCCT

  • Baader H-alpha / O-III / S-II f / 2 Ultra-Highspeed Filter Set - Premium Grade
  • 3.5 / 4 nm half width (to harmonize the exposure time of H-alpha with O-III / S-II), recommended for extremely fast optical systems from f / 3.4 to f / 1.8
  • Specially designed for the special filter requirements when used with highly opened optics such as the Celestron RASA astrograph
  • Enables the highest contrast even with the strongest light pollution, minimizes the size of the stars, makes the finest nebula details accessible - indispensable under Bortle 9/8/7 / (6) sky
  • Reflex-Blocker ™ hard-coated and optically polished - with sealed coating edges ( Life-Coat ™ )
  • Blackened edges all around, with a filter front indicator in the form of a black outer edge on the front
  • Optimized for modern CMOS cameras, but ideally suited 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/2.3
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 f/2 Ultra-Highspeed
SINGLE OR SET? Singles and Filter-Set
FILTER SHAPE round / square (depending on size)


 

In the Box

  • Baader 3.5 / 4nm f/2 Ultra-Highspeed Filters

      Warranty & Manuals

      Baader Limited Lifetime Warranty

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