Baader 6.5nm Narrowband Filter-Set – CMOS-optimized (H-alpha / O-III / S-II)

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Baader 6.5nm Narrowband Filter-Set – CMOS-optimized (H-alpha / O-III / S-II)

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€ 389.00 Price excl. German VAT tax (19%): € 326.89

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Which side should face the telescope?
  • Baader H-alpha / O-III / S-II Narrowband Filter Set – Precision Grade
  • 6.5 nm FWHM, recommended for optical systems from > f/3.4
  • 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

We explicitly warn against observing the sun with a DeepSky 6.5 nm (equivalent to 65 Ångstroem) H-alpha narrowband filter, specialized solar chromosphere and prominence filters from SolarSpectrum start at 0.8 Ångstroem. Photographic experiments with a camera are theoretically possible, but by no means observe the sun with naked eyes – you endanger your eyesight!

Baader Narrowband-/Highspeed Filter Selector

To make it easy for you in the future to decide which kind of Highspeed (or Narrowband) filter you need for your telescope, please check our Filter-Selector, that provides you the correct individual graph based on your entriest, in which you can find the perfect filter for your telescope by f/ration and central obstruction.

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€ 389.00 Price excl. German VAT tax (19%): € 326.89

Product Questions and Answers

Do you have a question about this product? Then we would like to ask you to first look through the existing questions and answers, most likely your question has already been answered and you will get the desired information much faster this way. Your question is not listed? Then please click on the button "Ask a question".

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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"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)

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What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)

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I would like to know if these 1.25 filters fit the ZWO filter wheel
Question by: Alfredo on Dec 11, 2022 4:18:00 PM | 1 Answer(s)

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I want to know if the thickness of these filters ads some extra space between a Focal Reducer with 55mm of backfocus and the sensor of my
camera. I purchased your 31mm narrowband filters (2mm thick). In case it does, I have calculated that this space would be about 0.6mm. Would this extra space be negligible if I wanted to get the most of my imaging train?

Thank you very much for your help,

Question by: Jordi on Mar 14, 2022 4:04:00 PM | 1 Answer(s)

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I am looking to buy narrow band filters to image nebulas. I am using the Skywatcher Newton Telescope OTA N 200/1000 DS f/5 in combination with either the Canon Ra camera or ZWO ASI 183 CMOS.
I prefer using the 2inch screw filters.
Is this the right filterset to go with or would you
Question by: Bert De Wilde on Oct 19, 2021 1:45:00 PM | 1 Answer(s)

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I have TS Newtonian with native f/4 ratio and I use it with reducer at f/3. I figured I would go with 6.5nm version, since I have low light pollution. I have problem deciding should I go with NB version (slower than f/3.4) or f2NB (f/2.3 to f/3.4).
Question by: Romas on Nov 24, 2023 5:45:00 PM | 1 Answer(s)

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I have a question about these filters narrowband (Ha,OIII, SII):
I know they are been designed to work with CMOS mono cameras, but I’m intersted in use them with a CMOS color camera, would it that be possible? (apart from the fact that it would not be an optimal use)
Question by: Lluis Guivernau on Nov 17, 2023 3:33:00 PM | 1 Answer(s)

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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:
    Baader CMOS Optimized Filters: Unleashing the Full Potential of Astrophotography

    Baader Blogpost:
    New CMOS-optimized Baader Filters

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