Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)

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Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)

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Previous version – no longer available

  • 2 ", 23 ° Safety Herschel Prism, utilizing special Phantom Group® coatings for glare control. 2” ClickLock® eyepiece holder.
  • There is no better and safer method for uncompromising sharp solar observation / photography in white light.
  • A special heat absorbing ceramic element traps radiant heat similar to the space shuttle heat tiles - without heating the surrounding area too. The fully enclosed housing adds to the safety and prevents the risk of glare.
  • Please choose version from dropdown to see scope of supply

Successor model:

The Baader 2" Cool-Ceramic Safety Herschel Prism (Visual #2956500V / Photo #2956500P) is no longer available and will be discontinued in its current form. We are very pleased to announce that we are able to offer you an improved successor, the Baader 2" Cool-Ceramic Safety Herschel Prism Mark II – (Visual / Photo) (various versions available)

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Product Questions and Answers

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What is the maximum refractor diameter that can be used with the Herschel prism? Would it be safe to use a 200mm, 250mm or even more, with the right neutral density filters?
Question by: Jesús Navas Fernández on Apr 7, 2022 11:39:00 AM | 1 Answer(s)

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The documentation states that the Solar Continuum filter can be removed when using a fully apochromatic APO refractor*. What is implied is that a 1.8 ND filter should be substituted when doing visual observing – with of course the 3.0 ND filter still being in place. Please confirm.

If this is the case, please also clarify if the 1.8 ND filter should be placed where the Continuum filter was with the 3.0 ND behind it closest to the eye piece, the other way around with the 3.0 ND closest to the prism with the 1.8 ND closest to the eye piece, or whether it makes no difference.

*The documentation specifically mentions Astro Physics, TEC, and Zeiss. I am using a Tele Vue-85 which claims APO performance.
Question by: Herb H. on Jun 11, 2020 3:49:00 PM | 1 Answer(s)

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I will use the prism with a 1.25 inch clicklock and have bought the 2 inch to T-2 adapter to do so. How can I unscrew the 3.0 ND filter from the threaded extension? It seems to be stuck or glued to it and I cannot apply more force without risking damage to. The solar continuum filter unthreaded easily.
Question by: Jan on Jan 25, 2021 10:56:00 AM | 1 Answer(s)

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Is this prism safe to use with a TeleVue NP127is refractor, which is a Nagler-Petzval design. In addition to the first objective doublet lenses, this has a second doublet at the focuser end of the OTA. Thank you.
Question by: Terry on Aug 23, 2019 6:55:00 AM | 1 Answer(s)

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I wanted to know if the Herschel prism is recommended to use it with a D-ERF filter in front of the lens to prevent heat from entering and protect the tube? or the D-ERF is only recommended for use in H & alpha ??
Question by: Rafael Segura on Apr 21, 2020 9:37:00 AM | 1 Answer(s)

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I have a bino Mark V and a glass path 2.7. How could I combine them with the BAADER HERSCHEL PRISM ?
Question by: Charles Lemaire on Jul 21, 2023 1:22:00 PM | 1 Answer(s)

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Could you please let me know how to use this prism in conjuntion with 1.25" double stack cotinuum + polarizing filter + Maxbright II binos?. Thanks in advance.
Question by: Jose Carvajal on Apr 26, 2020 12:23:00 AM | 1 Answer(s)

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Having used a 2” Lunt Herschel wedge for solar imaging for a while I decided to upgrade to a Baader 2" Cool-Ceramic Safety Herschel Prism (Photographic) in order to be able to reduce the exposure time and being able to freeze the seeing even more.
I ordered the new wedge from WideScreen-Centre in UK, which appeared to be one of few companies having the item in stock. The wedge arrived late last week. I’ve already been able to test it a couple of times and everything seems to work very well. However, I’m not able to remove pre-mounted ND OD 3.0 in order to install one of the less dense ND filters to reduce the exposure times. The Continuum filter unthreads just fine, but the filter is totally stuck. I’m afraid to apply to much force and are wondering if it might have thread lock (locktite) applied or if there some special “technique” in order to remove it.
Or do I need to get a another Baader Adapter 2" (male) / T-2 (male) # 1508035?
Not being able to swap the ND OD 3.0 for one of the less dense somewhat removes whole point for my upgrade.
Question by: Arne Danielsen on May 30, 2022 9:28:00 PM | 2 Answer(s)

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I'd like to utilize my BaaderHyperion Zoom eyepiece with the matching barlow lens in the Baader Herschel Prism. Unfortunately the protruding barlow addon is interfering with the built in filters. Which extension element can you recommend to shift the ClickLock eyepiece holder away from the filter case of the prism to allow the barlowed Hyperion Zoom fit snugly in the eyepiece holder?
Question by: Somogyi Zoltán on Nov 20, 2021 9:13:00 PM | 1 Answer(s)

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When inserting a GPC (2.6) into the adapter #27 (for binoviewing w. the Wedge), the GPC touches the ND filter. How can this be avoided? I could attach an empty 2 inch filter cell to gain some depth, but this is not mentioned in the Solar Wedge's manual. Am I doing something wrong?
Question by: Jan S on Apr 25, 2021 3:09:00 PM | 1 Answer(s)

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Hi there, can I use safely the wedge with a FSQ-106EDX4 to take pictures of the sun?
Question by: Jean-Pierre Berger on Dec 1, 2021 3:52:00 AM | 1 Answer(s)

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Can I use the BDSF sunscreen at the same time, to protect my lens from televue 85, and then put the herschell baader prism?
Would it work well?
Question by: Francisco on Jun 4, 2020 6:35:00 PM | 1 Answer(s)

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Is the Herschel wedge compatible with 1.25-inch eyepieces?
Question by: Michael Graham on Jan 7, 2021 12:13:00 AM | 1 Answer(s)

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Es seguro utilizar en un refractor skywatcher 150 -1200mm
Question by: Josep Pujol Caimel on Dec 31, 2021 6:25:00 PM | 1 Answer(s)

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Greetings. I am having focusing issues with this product on a Televue NP 101 (non is) telescope. Are there adapters than can help with this?
Thank you.
Question by: Giuseppe Barbieri on Jun 11, 2017 3:47:00 AM | 1 Answer(s)

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I have never used a Herschel Wedge before on my refractor--always mylar film, or glass filters on the forward end of the scope.
Will the unfiltered solar energy entering my(very expensive) air spaced triplet objective possibly damage the lens due to over heating? Could I use the wedge/and refractor continuously for 2 or 3 hours with out worry of damage to either? Thank you. Jon Mayer
Question by: Jon Mayer on Jul 11, 2019 5:59:00 PM | 1 Answer(s)

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Baader 2" Cool-Ceramic Safety Herschel prism, Visual and photographic

There is no better way for uncompromising Solar Observation / Solar Photography in white light


Every Solar Diagonal needs additional neutral density filters since the reflected energy of the first surface prism (4.6%) still is a factor of 1000 too large for the human eye. All Baader Solar Diagonals are delivered with a pre-mounted ND 3.0 Baader precision 2” light reduction filter. The photographic version includes other ND-Filters to achieve shorter exposure times. Use with care!

  • Space-Technology: The exiting beam in the Baader Safety Herschel Wedge is fed into a heat cage separated from the prism body. Like on a Space Shuttle a ceramic tile forming the back end of the heat cage absorbs the radiant heat without overheating its surroundings. The closed prism body offers perfect safety for educational work.
  • Solar Finder: The translucent ceramic tile acts as projection screen for the unfocused image of the Sun. Aiming the telescope at the Sun becomes very easy.
  • ClickLock 2“ Clamp: Securely clamp any eyepiece with only the push of a lever. Change eyepieces single handedly – even in winter with heavy gloves.
  • Filter Holder: A 2“/M48 threaded ring couples the 2“ ClickLock-Clamp to the body of the Safety Herschel Wedge and acts as a filter holder for 2“ filters.
  • Solar Continuum Filter (10nm HBW/540nm CWL): Included as standard filter
  • Optional recommended accessories:2“ Baader Polarizer-Filter (# 2408342) mounts into any 2“ eyepiece or 2“ to 1.25“ reducer for adjusting image brightness simply by rotating the eyepiece. Reducer ring 2“to T-2 (#1508035) allows to mount any DSLR-camera T-mount directly on top of the Solar Diagonal body
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4 Item(s)

Alain 172/06/2021 22/06/202105:50
  • Rating:
Solar Eclipse of June 10, 2020 with Baader Herschel Prism
I just received the photographic model one day before the Solar Eclipse of June 10, 2020.
So, it was my firsts attempt in Solar observing and imaging.
I find the Hershel helioscope easy to use thanks to the projection screen and the pre-mounted filters permits quick operational setup.
After observing with my zoom Baader 8-24-3,5 mm, I try some one-shot photos with my Canon EOS R.
Here’s one after quick Lightroom processing.

Alain, Malmedy - Belgique
  • Quality and easy to use
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E. Enzmann 83/03/2021 25/03/202109:07
  • Rating:
Sonnengranulen mit dem Baader Herschelprisma
Die Aufnahme wurde von einem 1 Meter AZ RC Teleskop von ASA nahe Bad Tölz am 26.2.2021 gemacht. Dazu wurde das Teleskop rund auf 320mm Off Axis abgeblendet.
Es wurde das hervorragende Baader Herschelprisma in Verbindung mit einem Baader Solar Kontinum Filter und einem 1.5 ND Filter hergenommen. Das Herschelprisma wurde von mir modifiziert mit aktiver Kühlung: Lüfter und zusätzlich angebrachte Lüftungsöffnungen. Die erste Variante hatte noch einen Föhn dran! Der war mir aber viel zu laut hat aber Kühltechnisch einiges an Wärme weggebracht. Nur habe ich bemerkt das man diesen Power gar nicht unbedingt braucht und habe einen leisen Lüfter nun drin der allerdings viel weniger Druck aufbaut.

Mit einer ASI 290mm Videokamera wurden 60 Sekunden lang bei einer Framerate von ca. 160 Bilder pro Sekunde in Full HD Auflösung aufgenommen und von diesen ca. 10.000 Einzelbildern wurde mit Stacking Programm AS3 die besten 1000 Einzelbilder (Lucky Imaging) gestäckt mit RegiStax geschärft und mit Photoshop nachbearbeitet.

Achtung ich möchte drauf hinweisen, dass nicht alle Teleskope so konzipiert sind Sonne mit größer Öffnung ohne Schutzfilter zu machen. Das Sonnenlicht und die Energie darin kann leicht Teile des Teleskops zerstören gerade wenn es zum Fokuspunkt kommt da die Energiedichte hier extrem stark zunimmt.

Deswegen klären Sie bitte unbedingt mit dem Händler ab, ob Sie solch einen Setup mit Ihrem Teleskop gefahrlos machen können oder ob hier zusätzliche Filter notwendig sind. Auch wichtig lassen Sie größte Sorgfalt walten denn bei größeren Öffnungen ist es gefährlich mit der Sonne zu arbeiten und schauen Sie niemals hier mit Ihrem Auge rein.

Ein kurzer Blick bei solchen Öffnungen und der im Fokus extrem starken Energie kann Ihnen das Augenlicht kosten.

Am 25.4.2021 hatte ich First Light vom neuen 12“ APO von TEC. Gegen 14 Uhr ist diese Sonnenflecken Gruppe Bild entstanden. Dazu wurde das Herschel Prisma von Baader verwendet und mit einer ASI 290mm wurde ein Video von 60 Sekunden Dauer aufgenommen. Anschließend wurden die die besten Einzelbilder mit AS3 gestäckt mit RegiStax und Photoshop bearbeitet.
Es handelt sich um eine der ersten Gruppen von Sonnenflecken des neuen Zyklus.

Am 14.5.2021 war der Himmel wie auch die letzten Tage bewölkt aber plötzlich machte der Himmel für ca. 20 Minuten auf. Das gute Seeing in diesem kurzen Zeitfenster erlaube eine 2 fach Barlow Lens ein zu setzen die die Sonnengranulation in recht hoher Vergrößerung und vielen Details zeigt. Als Teleskop diente ein TEC 12" FL APO montiert auf einer ASA 500 Montierung.
Mit einer ASI 290mm Video Kamera wurden mit dem Baader Herschel Prisma (welches von mir mit einer aktiven Luftkühlung umgebaut wurde) ein Video von 60 Sekunden Dauer gemacht. 150 der besten Einzelbilder wurden durch das Programm AS3 gestäckt und per RegiStax geschärft sowie final mit Photoshop bearbeitet.

  • Sehr feine Details auf der Sonnenoberfläche
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Michael S. 134/05/2020 14/05/202007:55
  • Rating:
Makelllose Sonne mit dem Baader Cool Ceramic Herschelkeil und 4 Zoll APO Triplett
Um mich für den kürzlich gestarteten 25. Zyklus vorzubereiten, habe ich mir den Baader Cool Ceramic Herschelkeil mit dem inkludierten 2 Zoll Solar Continuum und ND 3.0 Filter gekauft. Dieser soll dann in der hoffentlich bald aktiver werdenden Sonne zusammen mit meinem Skywatcher ESPRIT 100 und einer monochromen ZWO Asi Kamera Verwendung finden. Anbei ein kleines Mosaik aus 3 Teilen bestehend vom 9. Mai 2020, Mosaik weil ich eine kleine Barlow verwendet hatte.
Die einzige Herausforderung war das in-Fokus kommen, - dazu musste ich die 11/4 Zoll "Nase" der Kamera abschrauben, um möglichst nahe ranzukommen, sonst wäre es sich nicht ausgegangen.
  • Harmoniert sehr gut mit meiner monochromen Kamera. Sichere Beobachtung der Sonne im Kontinuum, bzw. der recht gute Kontrast.
  • -
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Robert 160/06/2017 10/06/201708:01
  • Rating:
Excellent for hard core solar observers & Photo
I use the photographic model for both visual and photography. I use it with a TV 85 APO refractor and a 152mm Officina Stellare APO triplet refractor.. I was concerned that my TV 85 APO wouldn't have enough in focus for photography. But with the removal of the Click lock and replacement with the Tmount adaptor and my Niikon DSLR it comes to focus with about 3/16" to spare on focuser travel. The other scope is no problem either.
Optically this is the ultimate for white light photography. I also have BAADER Astro Solar Film filters that up to now have been my choice. But the Hershel Wedge gives even better results with fine detail and nice crisp images without flare or ghost images. The Solar Conitinuum filter is designed to work with achromats but even APOs will benefit. Larger magnification images hold together extremely well..
The real question is whether the big difference in cost between the Hershel Wedge and BAADER Astro Solar Film is giving the best bang for the buck? If you are only an occasional observer, not a photographer, it may not be worth it. But if you are a hard core solar fan than I recommend it highly. By the way also have a Ha solar scope and while that is fantastic....the two views are very different. If you don't know what I am talking up on the differences and than you can decide if you want to get the wedge.
  • Construction and quality are laboratory grade, fantastic images visual and photo
  • Expensive but worth it if you are a solar fan
    • @Robert Thanks for this review. I have an Orion EON 130mm Triplet ED Apochromatic Refractor with a 0.8x focal reducer/flattened. Do you think I'd have any problems reaching focus with that scope or taking photos with my ASI183 Pro Mono? Thanks
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