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

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

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€ 735.00 Price excl. German VAT tax (19%): € 617.65

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Which side should face the telescope?
  • Baader H-alpha / O-III / S-II f/2 Ultra-Highspeed Filter Set – Premium Grade
  • 3.5 / 4 nm FWHM (to harmonize the exposure time from H-alpha with O-III / S-II), recommended for extremely fast optical systems from < f/2.3
  • Specially designed for the special filter requirements when used with extremely fast f/2 optics like the Celestron RASA astrographs
  • 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

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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€ 735.00 Price excl. German VAT tax (19%): € 617.65

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'am using de 2" Ultra High Speed filters Ha, SII en OIII for my C14 Hyperstar. Can you tell me which side of the filter should point to the camera? Or does this not matter.
Question by: Edwin van der Sijde on Sep 18, 2021 11:03:00 AM | 1 Answer(s)

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Are there downsides when using the 'ultra fast' filters with 'slower' sytems. For example if I were to use the ultra fast filters on an f7 system would there be any negative effects? (I have both fast and slow systems and was planning on buying the ultra fast set but only if I can also use them with the slower setups)
Question by: Michael on Jul 8, 2021 12:20:00 PM | 1 Answer(s)

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Your F2 summary page based on the whitepaper results state if you're imaging in a light polluted Bortle 6 sky and above the 3.5/4nm filters are recommended rather than the 6.5nm ones. If I were to purchase the narrower ones what affect will it have if shooting from a lower than Bortle 6 sky? Also what difference will there be compared to the 6.5nm versions in the same situations?
Question by: D on Jul 13, 2022 2:07:00 PM | 1 Answer(s)

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Hi, besides a telescope i am also using the following setup: Canon EOS Ra + Canon L series high speed lenses (from wide angle to 400mm). I own multiple 2" M48 (threaded) NB filters and want to expand this (2" mountable only).

Question: Do you offer / know a good solution to use my Baader 2" filter set in combination with the Ra+Canon lenses please?
Question by: Bert De Wilde on Nov 23, 2021 7:54:00 AM | 1 Answer(s)

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What happen when i use this ultrfast narrowband filters recommended for F3,4-1,8 on a F4?
Question by: Jan on Dec 21, 2021 2:09:00 AM | 2 Answer(s)

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What is the actual disadvantage of using these filters with a Kodak KAF 12600 CCD mono chip. What is the resistance of these filters, especially the OIII, to bright star hallows caused by fast optics.
Question by: Lynn on Aug 28, 2021 11:25:00 PM | 1 Answer(s)

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I have the Celestron EdgeHD 11 and HyperStar v4. I already have a set of Baader 6.5nm Narrowband 2" CMOS Optimized filters, but they are not optimized for the f/1.8 I will get with HyperStar. What will really be the difference I see with the Ultra Highspeed filters compared with what I have?
Question by: Martin Cohen on Oct 25, 2021 5:11:00 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

    Baader Blogpost:
    The new "f/2" narrowband filters from Baader in use.

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    4 Item(s)

    Yannick Akar 135/05/2022 16/05/202220:12
    • Rating:
    f/2 Highspeed (CCD-Filterset) vs. f/2 Ultra-Highspeed (3.5/4 nm) – CMOS Optimiert
    Equipment für den Filtervergleich und Beispielbilder:
    Celestron RASA 11” f/2.2, ZWO ASI 1600MM Pro (Alle Fotos außer NGC 2244 – Rosettennebel) / QHY268M, Baader f/2 Ultra-Highspeed Filterset 50x50 mm, Baader RGB Filterset CMOS, Baader UFC + UFC Tilter.

    Ein direkter Vergleich:

    F/2 Highspeed Filter: Mich hat die frühere Reihe der f/2 Highspeed Filter seit etwa 2.5 Jahren begleitet und ich habe damit tolle Ergebnisse, sowie auch einige Auszeichnungen erzielen können. Gerade der H-alpha und S-II Filter haben auch bei meinem eher schlechten Bortle 6/7 Himmel einen guten Kontrast erzielt, der O-III Filter hatte da schon mehr mit meinem hellen Himmel und dem Mond zu kämpfen. Ich habe den deutlichen helleren Hintergrund immer durch kürzere Belichtungszeiten bzw. niedrigeren Gain ausgeglichen. Das allbekannte Halo-Problem um helle Sterne habe ich meistens nur beim O-III Filter (manchmal aber auch beim S-II Filter) feststellen können. Durch vorsichtige Bildbearbeitung konnte ich die Halos aber meistens restlos „retuschieren“.

    F/2 Ultra-Highspeed Filter (3.5 / 4 nm): Die neuen Ultra-Highspeed Filter zeigen dagegen „out of the Box“ einen deutlich höheren Kontrast, Sterne werden wesentlich besser unterdrückt und Nebelstruckturen sind deutlich hervorgehoben (Vergleichsbilder WR 134). Ich habe bisher keinerlei Reflexionen oder Halos feststellen können und das bei f/2.2! Das neue Filterset harmonisiert zudem wesentlich besser bei gleichen Belichtungszeiten von H-alpha/S-II mit O-III. Ich belichte mittlerweile in allen drei Schmalbandkanäle mit dem gleichen Gain/Belichtungszeit und erreiche bei allen Filtern einen ähnlichen Mittelwert.

    Eine deutliche Kontraststeigerung in allen Schmalbandkanälen! Der O-III Filter zeigt definitiv den gravierendsten Unterschied – keinerlei Reflexionen und nur minimale Halos bei super hellen Sternen wie Alnitak. Der H-alpha und S-II Filter sind absolut tadellos! Hervorragend optimiert für die neuen CMOS Sensoren (IMX 571 / IMX 455), aber auch an den älteren CMOS Sensoren wie dem Panasonic MN34230 Chip (ASI 1600MMP) problemlos einsetzbar.
    • High Class Filter mit einem super Preis-Leistungs-Verhältnis – Meiner Meinung nach die besten Schmalbandfilter für Hyperstar bzw. RASA Optiken!
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    Christoph Kaltseis 102/04/2022 13/04/202209:51
    • Rating:
    M42 als Intensives SHO Bild mit den Ultra Narrowband f2 Highspeed Filter
    In der Erstellung an den RGB Eindruck gehalten, der die Verteilung etwas beschreibt;
    Mit dem dem RASA 8 f2.0 + dem FCCT + QHY268M und den Baader Ultra Narrowband f2 highspeed filters für H-Alpha (3,5nm), OIII(4nm) & SII(4nm).
    Keine Spur eines Reflexes oder Halo! und sehr wenig die Belichtungszeit = 64min für alle SHO Daten!
    Montierung + Autogiuding: Celestron CGX + StarAID-B + QHY Mini GuiderScope
    HDR Version mit einer Belichtungszeit!
    CS Christoph
    • Alles und besonders die Größe und Stabilität des Systems!
    • nix
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    Julian Shroff 323/11/2021 20/11/202111:22
    • Rating:
    New filters for a new era of narrowband imaging
    For a long time, imaging at F2 was sort of an RGB-only thing for me. But when I came upon the new Baader High Speed Ultra Narrowband F2 Filters, that changed. With the new ability to shoot narrowband targets at 3.5/4/4nm for Ha/Oiii/Sii respectively, this truly changed the way I view narrowband imaging.

    After thoroughly testing the new filters, I'm happy to say that they work just they way they are supposed to: They produce deep and clean images of narrowband targets with high-resolution CMOS cameras, while avoiding the common issues of F2 imaging such as reflections or halos.

    I have three sample images which were between 4 and 8 hours of integration time each with my RASA 8" and QHY183M Monochrome camera.
    • Everything, really. Affordable filters that produce very clean images. What more could we want? :)
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    • Watch my video
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    Maurice Toet 288/10/2021 16/10/202112:30
    • more than 2 year(s)
    • Rating:
    Ultra-Highspeed CMOS-optimized Narrowband Filters
    With these new Ultra-Highspeed filters Baader Planetarium indeed found their way. I use the Ha (3.5nm), OIII (4nm) and SII (4nm) in combination with a Takahashi Epsilon-180ED f/2.8 and ZWO ASI294MM Pro in severe light pollution (Bortle 8/9) from my garden observatory in The Netherlands. Here's an example of an SHO colour mapped image over approximataly 29 hours of integration time captured with this setup. Thanks to the new coating-technology of these CMOS-optimized filters, halos have become history.
    • Great value for money, excellent suitable for CMOS sensor thanks to new coating-technology
    • -
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