Baader 7.5nm Solar Continuum Filter (540nm)

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Baader 7.5nm Solar Continuum Filter (540nm)

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€ 118.00 Price excl. German VAT tax (19%): € 99.16

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  • Baader 7.5 nm Solar Continuum Filter, CWL 540nm
  • A must for owners of achromatic refractors. This narrowband-filter cuts the spectral range where lens optics draw sharpest and contrastiest. The Baader Solar Continuum Filter lets you use the full power of your telescope.
  • Enhances contrast and reduces the effect of atmospheric turbulence (in combination with white light solar filters)
  • Enormous contrast gain in monochrome photography even on apochromatic systems
  • Important note: The Solar Continuum Filter must be used ONLY with additional filtering (e.g. Baader Herschel prism or AstroSolar Safety Film)

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€ 118.00 Price excl. German VAT tax (19%): € 99.16

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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 have the Baader Solar Continuum (part# 2458390) and Baader UVIR Cut CMOS (part# 2961570) filters. Would the Baader Solar Continuum (part# 2961580) make a noticeable
difference ?
The spec sheet for both Continuum filters show the same transmission ranges of 535nm - 545nm.

Question by: Philippe Fossier on Oct 4, 2022 10:51:00 PM | 1 Answer(s)

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Does the solar continuum filter perform equally well with either side facing the sun ?
Question by: Christophe S. on Oct 23, 2022 1:09:00 AM | 1 Answer(s)

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Will it be possible in the future to have this filter for Sony's mirrorless camera also?
It would be a fantastic option also for who doesn't have a telescope.
Question by: Max on May 16, 2024 9:23:00 AM | 1 Answer(s)

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Baader 7.5nm Solar Continuum Filter – for Visual and Photographic Observations of the Sun

The Solar Continuum Filter is practically a narrow band photosphere filter for solar observation in white light. It provides the highest contrast in the photosphere of the sun. The filter works as a monochromator: suppressing the effects of the atmospheric turbulence and delivering images that are significantly sharper.

Lens systems - including those of apochromats, catadiopters or eyepieces - are traditionally optimized for the spectral range around 540nm, since this is where our eye has the highest sensitivity. This narrowband filter therefore blocks everthing with the exception of the spectral range in which a lens optic works most sharply and with the highest contrast. The effect is greatest on achromatic lens telescopes; but there is also an effect on apochromatic telescopes, catadioptric systems, and even pure mirror systems by reducing air turbulence.

As a monochromatic filter, it is ideal for use on monochromatic cameras and can even provide a tremendous gain on pure color systems.

Zeiss AS 150/2250 with Herschel Wedge, ND3 and ND0,9
Zeiss AS 150/2250 with Herschel Wedge, ND3 and Baader 7,5 nm Solar Continuum

With a colour camera, as with deep-sky narrow-band photography, it is less effective as only the green pixels are used. Thus, although you still benefit from the improved image sharpness of the telescope that is optimised for green wavelengths (and the reduction of the influences of air turbulence), with a colour camera you cannot fully exploit the better image quality compared to monochrome cameras, as you are effectively working with reduced camera resolution.

Compared to the previous model with a 10nm half-band-width, this filter has a half-band-width of only 7.5nm, which increases the contrast even more. It thus replaces both the previous Baader 10nm Solar Continuum filter and the stacked 1 ¼" filter #2458392. The single filter is so good that stacking is no longer necessary - the contrast gain of a single 7.5nm filter makes stacking unnecessary, and this performance is now also available in 2".

The Baader 7.5nm Solar Continuum filter is also be included in the scope of delivery of the Cool Ceramic Herschel prism Mark II, which is in preparation.

Test report:

Baader Blogpost:
Test Report: Baader Solar Continuum Filter revisited – now with 7,5nm FWHM

The Baader 7.5 nm Solar Continuum also offers all the advantages of the CMOS-optimized Baader filters:

  • Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
  • Reflex-Blocker coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
  • 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

Baader Blogpost:
New CMOS-optimized Baader Filters

Important information for Solar Observing

For purely VISUAL observation, the Solar Continuum filter must ONLY be used in combination with our Herschel wedge with an additional ND3 filter or alternatively with the AstroSolar Safety Film (ND 5.0). The Solar Continuum must always be installed behind the actual solar filter.

The combination of AstroSolar photographic film (ND 3.8) and Solar Continuum filter or the photographic ND filters of the Herschel wedge must only be used for photographing the sun at the highest magnifications. These weakers must only be used to achieve very short exposure times with a camera, and thus to minimise the influence of air turbulence. AstroSolar photo film (ND 3.8) is also not suitable for mounting directly in front of a camera lens. The resulting image brightness is much too high.

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4 Item(s)

langlois 185/07/2023 05/07/202303:54
  • Rating:
nouveau filtre trés bon
la granulation et les details sur les taches imagerie et visuel sont superbes
  • la qualité
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andig 116/04/2023 27/04/202313:10
  • Rating:
Hält, was er verspricht
Ich beobachte häufig schnell mal in der Mittagspause aus einen geöffneten Dachfenster heraus. Dementsprechend grottig ist das Seeing. Heute war es wieder mal besonders schlecht und ohne den Filter war bei ca. 30-40x Schluss. Mit Filter konnte ich immerhin eine Vergrößerung von 60x nutzen.
  • Die Verbesserung ist sehr deutlich, und das sieht man auch auf den ersten Blick.
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SFW 301/10/2022 29/10/202220:49
  • Rating:
Macht Lust auf mehr…
Ich habe den Filter jetzt etwa zwei Wochen und konnte ihn während der Sonnenfinsternis testen - ich bin begeistert. Die Bildqualität der Rohdaten ist deutlich kontrastreicher, was sich dann auch im fertigen Bild zeigt.
Ich freue mich auf die kommenden klaren Wintersonnentage, um weiter mit dem Filter zu arbeiten und mein erstes Bild eines Sonnenflecks noch zu verbessern.

P.S. Leider waren ein paar Staubflocken auf dem Zenitprisma - jetzt aber nicht mehr.
  • Der Gewinn an Kontrast schon in den Rohdaten.
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Astro Tafelberg 300/10/2022 28/10/202209:18
  • Rating:
Erster Einsatz bei der partiellen SoFi am 25. Oktober 2022
Der neue, nunmehr 7.5nm anstatt 10nm SOLAR CONTINUUM Filter hatte sein "first light" im Safety-Herschelprisma am Tag der partiellen Sonnenfinsternis am 6 Zoll APO Triplett, da ich damit die gesamte Sonne gerade mal so auf den Kamerasensor bringen konnte, was bedingt durch die Telezentrik bei Verwendung vom Baader SunDancer II nicht möglich gewesen wäre. Ich habe den neuen SC Filter zusammen mit dem ND3.0 Filter im Herschelkeil verwendet wie zuvor jenen mit 10nm, aber jetzt keinen direkten Vergleich mit dem Vorgängermodell gemacht, dazu war in der Hektik während der SoFi keine Zeit.
Wieviel Kontrastgewinn also gegenüber dem 10nm tatsächlich vorliegt kann ich somit nicht sagen, aber zumindest, dass das Ergebnis sehr ansprechend geworden ist.
Bilder anbei vom Tag der SoFi und vom Folgetag, klarerweise ohne Mond.
  • Zusammenspiel mit dem Baader Safety Herschelprisma
  • Preis.
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