Brand: Baader Planetarium

Baader Planetarium 3.5/4nm Ultra-Highspeed-Filter Set CMOS-Optimized (H-alpha / O-III / S-II)

Brand: Baader Planetarium

Baader Planetarium 3.5/4nm Ultra-Highspeed-Filter Set CMOS-Optimized (H-alpha / O-III / S-II)

  • Baader CMOS H-alpha / O-III / S-II f/2 Ultra-Highspeed Filter Set
  • 3.5 / 4 nm FWHM (to harmonize the exposure time from H-alpha with O-III / S-II)
  • 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
Special Order
$1,119.95 CAD

Focal Ratio

f/2 (<f/2.3) f/3(f/2.3 - f/3.4) f/4 (>f/3.4)

Filter Size

1 1/4" 2" 31mm 36mm 50.4mm 50mmx50mm 65mmx65mm

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Special Order
$1,119.95 CAD

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Product Description

Note: this filter has multiple size & focal length options. See below for details.

This new generation of Baader CMOS-filters features:

  • 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

Sizing & Focal Ratio SKUs Table

f/2 (for <f/2.3) f/3 (for f/2.3-f/3.4) f/4 (for >f/3.4)
1 1/4" (Mounted/Round) 2961680 2961640 2961670
2" (Mounted/Round) 2961683 2961643 2961673
31mm (Unmounted/Round) 2961681 2961641 2961671
36mm (Unmounted/Round) 2961682 2961642 2961672
50.4mm (Unmounted/Round) 2961684 2961644 2961674
50mmx50mm (Unmounted/Square) 2961685 2961645 2961675
65mmx65mm (Unmounted/Square) 2961686 2961646 2961676

What's in the Box

  • One Baader Planetarium 3.5 / 4nm Ultra-Highspeed-Filterset of your Choosing

Specifications

Manufacturer Baader Planetarium
Net weight (kg) 0.18~0.26
Size & Shape Seven Options Available:
  • 1.25" - Mounted (Round)
  • 2" - Mounted (Round)
  • 31mm - Unmounted (Round)
  • 36mm - Unmounted (Round)
  • 50.8mm - Unmounted (Round)
  • 50mmx50mm - Unmounted (Square)
  • 65mmx65mm - Unmounted (Square)
Suitable for f/ratio Three Options Available:
  • f/2 (recommended for <f/2.3)
  • f/3 (recommended for f/2.3-f/3.4)
  • f/4 (recommended for >f/3.4)
Transmission Range H-alpha / O-III / S-II
Filter Thickness (without cell)
  • 2 mm (1.25" / 2" / 31mm / 36mm Sizes)
  • 3mm (50.4mm / 50mmx50mm / 65mmx65mm Sizes)
HBW (Half Bandwidth) 3.5 nm (H-alpha) / 4 nm (O-III / S-II)
CWL (Central Wavelength) 656.3nm / 500.7nm / 671.7nm
AR-Coating Reflex-Blocker™ hard coated, planeoptically polished
Special Features CMOS-optimized with Life-Coat™
Filter size Multiple Size Options Available
Filter Usage CMOS, CCD, H-alpha, O-III, S-II
Single or Set? Filter-Set

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