Baader 2" Cool-Ceramic Safety Herschel Prism Mark II – (Visual / Photo)

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Baader 2" Cool-Ceramic Safety Herschel Prism Mark II – (Visual / Photo)

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€ 575.00 Price excl. German VAT tax (19%): € 483.19

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  • 2" wedge prism according to Herschel - one-sided Phantom Group® anti-reflective coating, with ceramic solar finder and 2" ClickLock® eyepiece holder
  • Integrated rotation mechanism for polarising filters – the best method for brightness adjustment in visual solar observation and solar photography in white light
  • Stepless brightness adjustment is made possible in combination with the optional Baader Single Polarizing Filter 2" (#2408342 , € 72,-) and the included Neutral Density Filter. The polarizing filters are not included in the scope of delivery
  • Including our Baader 7.5 nm Solar Continuum Filter 2" (540nm) (#2961581 , € 198,-) for an uncompromisingly sharp solar image and the Baader 2" Filter Crown Tool (#2458135 , € 35,-) , to make it easier to replace the installed filters.
  • S58 dovetail and Safety Kerfs on the 2" nose-piece, New 3-point adjustment system preset in the factory
  • Available in visual and photographic versions, please choose from dropdown

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€ 575.00 Price excl. German VAT tax (19%): € 483.19

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Is it safe to use this on my 12 Mewlon 300?
Question by: Bill Bean on May 10, 2024 5:21:00 PM | 1 Answer(s)

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

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

A Herschel wedge allows the use of highest magnifications on the refractor without loss of quality.

The Baader 2" Cool-Ceramic Saftey Herschel prism features:

  • an integrated rotation mechanism for polarising filters – the best method for brightness adjustment in visual solar observation and solar photography in white light. This filter rotation mechanism allows filters to be rotated steplessly in the optical path. Since the Herschel prism emits single polarised light, a stepless brightness adjustment is made possible in combination with the optional Baader Single Polarizing Filter 2" (#2408342 , € 72,-) and the included Neutral Density Filter. All necessary filters always remain in the Herschel prism, even when changing eyepieces!

  • includes the Baader 7.5 nm Solar Continuum Filter 2" (540nm) (#2961581 , € 198,-) with 7.5 nm half-band-width for an uncompromisingly sharp solar image.

    Herschel prisms must always be operated with additional light attenuation filters. Every Herschel wedge 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 and Solar Continuum Filter. The photographic version includes even more ND filters for selective light attenuation when using cameras and high magnifications.

  • S58 dovetail – as on the Steeltrack focuser – for the use of the following three adapters
  • the new 3-point adjustment system of the wedge, preset in the factory
  • Safety Kerfs on the 2" nose-piece
  • Sturdy transport case made of ABS plastic, air sealed IP67
  • Available in two versions:

The advantages of the Safety Cool-Ceramic Herschel prism

  • Space-Technology: A multiple staggered light trap made of heat protection sheets and heat-absorbing special ceramics as the end of the light trap - similar to heat tiles on the space shuttle - absorbs the radiant heat without heating the surroundings too much. The prism also remains temperature-stable for a long time.

  • Enclosed housing: no risk of glare or fire from the emitted sunlight, observation is possible without danger

  • Solar Finder: The ceramic plate also acts as a screen for the sunlight beam. Aiming the telescope at the sun becomes very easy.

  • ClickLock“ Clamp: with a 15° rotation you clamp every eyepiece securely - even in winter with heavy gloves.

  • Short overall length: shortening the overall length by 30 mm for the use of DSLR or Binoviewers with optional T-2 adapter Diamond Steeltrack® S58 to T-2 BDS-Adapter (#2957202 , € 27,-) or  Diamond Steeltrack® S58 to M48 BDS-Adapter (#2957204 , € 29,-)
  • Filter Holder: On the rotatable filter holder, all necessary filters are firmly installed in the housing - no danger when changing eyepieces!
  • Brightness adjustment for photography: To let enough light through for photography at high magnifications, the pre-installed ND3 filter can be replaced by weaker filters (sold separately, or included with the photo version). Baader Safety CoolCeramic Herschel Prism 2" Photographic (#2956510P , € 645,-) .

The Herschel wedge is based on the principle of using only a small part (4.6%) of the incident light for the actual observation. These 4.6% are reduced again by a factor of 1000 to a harmless level by the ND 3.0 neutral density filter, which is installed as standard in both versions. The unequally larger, high-energy part of the light falls through the housing and forms a focal point in the air outside. Even far behind this focal point, this light concentration would still be irritatingly bright and dangerous if an inexperienced observer were to accidentally (or wantonly) look into the output beam. Therefore, our Herschel prisms have been using light traps for years to eliminate this risk. With the closed light trap with Cool-Ceramic protection plate, observing the sun with a Herschel prism is possible without danger for private persons as well as for public institutions and schools.

You do not need an additional objective solar filter in front of your refractor telescope to safely observe the sun with the Baader Cool-Ceramic Herschel prism and the built-in ND 3.0 filter!

Please note: Herschel prisms must not be used on Petzval systems or other telescopes that have glass in the optical path near the focal point. Multi-lens systems do not pose a problem as long as the optics are at the front of the telescope. As long as the light has not been focused (i.e., the energy has not yet concentrated at the focal point), the heat input is no greater than solar energy on a white surface in summer. Ergo, it is a long held and just as often disproved misconception that refractor optics degrade or get too hot. All refractor optics whether oil or air gap, which are distributed by the company Baader Planetarium, are absolutely able to make solar observations by means of Herschel prism. The oils used are all UV resistant. (However, we can only speak here for the products of the brands we know - if necessary, refer to the manual of your telescope to see if it is suitable for solar projection).

Especially interesting is solar observation with a large aperture telescope like a  Triband-SCT - Schmidt-Cassegrain-based Multi-Purpose-Telescope, for Sun and Deep Sky (various versions available)  - the Schmidt corrector equipped with an energy protection filter allows to use telescopes up to 11" aperture also for solar observation with a Herschel prism!

Technical details:

Telescope side connection options (included as standard):

  1. 2" (50.8 mm) nosepiece with safety groove and M48 filter thread

  2. Dovetail ring (ring groove) S58 x 3.7mm, e.g.  for connection to Zeiss M68 and other Baader connection standards with optional adapters

Eyepiece side connection options (included as standard):

  1. 2" (50.8 mm) Clicklock clamp with brass clamping ring

  2. Dovetail ring (ring groove) S58 x 3.7mm, as on SteelTrack focuser

Housing: Metal; milled and matte black anodized; pearl white textured finish

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Astro Tafelberg 47/02/2024 17/02/202412:07
  • Rating:
Perfekt für die Weißlichtbeobachtung
Setze den Herschelkeil zusammen mit ND3.0 und SC7.5nm am SW ESPRIT 150ED Apo bei voller Öffnung ein. Gleich ob mit oder ohne Barlow, jedenfalls mit monochromer Kamera ergeben sich feine Details in den Fleckengruppen, bzw. werden weitläufige Fackelgebiete am Sonnenrand sichtbar.
  • Schärfe und Detailreichtum der Ergebnisse
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Marco 231/08/2023 20/08/202308:47
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Klare Abbildungsleistung
Manchmal muss man zwischen dem Kauf und dem Einsatz eines astronomischen Gerätes sehr viel Geduld mitbringen.

Nach 3 Wochen des Wartens (nach dem Kauf) auf annehmbares Wetter, konnte ich dann das Herschelprisma, zumindest optisch, vor 6 Tagen kurz testen.
Wolkenlücken genutzt, und alles (Triband 8") aufgebaut.

Zuerst musste ich allerdings das Gerät, lt. Bedienungsanleitung, noch auf die Gegebenheiten des Tribandes umbauen.

Dies stellt allerdings kein Problem dar, und ist schnell erledigt.
Man sollte sich allerdings genau an die Bedienungsanleitung halten, um eklatante Umbaufehler (siehe Hinweise in der Anleitung) zu vermeiden.

Nun, der erste Einblick war ernüchternd.
Sollte das Seeing tatsächlich so schlecht sein, um wenigstens kurz scharf sehen zu können (kann eigentlich gar nicht sein)?
Die Enttäuschung war erst groß, doch dann erinnerte ich mich an einen Trick, den ich von meinem 50/600 H-Alpha Teleskop kenne.
Hier muss ich den teleskopseitigen Stutzen, mit dem Etalon etwas aus der Klemmung ziehen, um in den Fokus zu kommen (man entschuldige meine laienhafte Beschreibungsweise, aber hier soll ja lediglich bewertet werden).

Also den teleskopseitigen Stutzen des Herschelprismas aus der Klemmung am Teleskop, etwa 1cm herausgezogen (die Länge des Stutzens gibt es her, dass man hier keine Verkippung des Prismas befürchten muss, auch wenn man evtl. eine DSLR, oder PC-Kamera daranhängt).

Und siehe da, eine scharfe, kontrastreiche Abbildung war möglich, sehr schön.

Also, da ich mir natürlich gleich die fotografische Version zugelegt hatte, auf ein gutes Wetter gewartet (was dann auch gestern soweit war).

Da ich ein ungeduldiger Mensch bin, habe ich wieder ausschließlich meine DSLR angehängt, und mit OneShots gearbeitet.
Und trotz dessen, dass ich keine Serienaufnahmen, mit anschließendem Stacking, und Nachbearbeitung gemacht hatte, sondern lediglich das einfache Windows Betrachtungsprogramm nutzte, bei dem ein paar wenige Möglichkeiten bestehen, nachzuarbeiten, kann man (an den angehängten Bildern) schon erkennen, zu was das Herschelprisma fähig ist.

Nicht zu vergessen, die Möglichkeit, den Polfilter, mit dem integrierten Schieberegler zu justieren, ist prima.

Ich denke, die technische Umsetzung, auch speziell mit der verbauten Keramik, spricht für sich.

Zwar habe ich keinen Vergleich zu anderen Herschelprismen / -keile, aber ich kann für mich sagen, dass ich zufrieden mit dem Produkt bin.
  • Qualität, Abbildungsleistung
  • Der Polfilter könnte im angebotenen Set mit integriert sein, und nicht optional
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Miro 134/05/2023 15/05/202307:59
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Geniales Produkt
Wer ernsthafte Beobachtungen im Weißlicht der Sonne durchführen möchte kommt nicht um einen Herrschelkeil herum.
Der Informationsgewinn gegenüber der schon sehr guten Filterfolie ist schon enorm, und für Refraktor Besitzer ein absolutes „Must Have“.
Ich bin sehr zufrieden damit.
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