Baader O-III Ultra-Narrowband-Filters (4nm) – CMOS-optimized

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Baader O-III Ultra-Narrowband-Filters (4nm) – CMOS-optimized

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€ 244.00 Price excl. German VAT tax (19%): € 205.04

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  • Baader O-III Ultra-Narrowband Filter – Premium Grade
  • 4 nm FWHM, 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 telescope-sided black outer rim
  • Optimized for modern CMOS cameras, but likewise excellent for CCD camera technologies

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€ 244.00 Price excl. German VAT tax (19%): € 205.04

Product Questions

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What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?
132
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
What are the threads and pitch of your 1.25" and 2" filters?
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Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)
Description

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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

  • Further information, test reviews, image results...

    Don´t be misled.

    These all new CMOS-optimized filters work magnificently with all existing digital camera technologies, be it CMOS or CCD. However – an owner of CCD-camera-technology will still find our previous, extremely affordable, narrowband filter technology to be fully apt for excellent imaging. But: "the Better always is enemy to the Good".

    ... can be found on our detailed Blogpost:

    Baader Blogpost:
    New CMOS-optimized Baader Filters

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    Frank Küber 203/07/2021 23/07/202113:41
    • Rating:
    O-III ULTRA-NARROWBAND-FILTER (4NM) - 36mm (ungefasst)
    First Light (18.7 - 22.7.2021, zunehmender Mond (55% - 98%), Standort Hochtaunus mit div. Straßenbeleuchtung): Im Gegensatz zu den Vorgängermodellen (7nm, 36mm ungefasst) und 2" gefasst (4,5nm und 7nm) im gleichen Setup (1200mm F8 APM LZOS und 82mm Riccardi Flattner, Kamera ZWO ASI 2600) keinerlei Reflexe oder Sternhalos. Definitiv eine Verbesserung. Der entsprechende Ha Filter zeigt ebenfalls eine ausgezeichnete Performance. Den SII Filter habe ich noch nicht getestet.
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