Baader Solar Continuum Filter (540nm)

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Baader Solar Continuum Filter (540nm)

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€ 85.00 Price excl. German VAT tax (19%): € 71.43

  • Baader Solar Continuum Filter, 10nm / CWL 540nm
  • A must for owners of achromatic refractors. This filter cuts the spectral range transmitting a specific spectral range around 540nm, completely cutting out blue and red wavelengths in an area of the lens system that where the optics are at their sharpest.
  • Enhances contrast and reduces the effect of atmospheric turbulence.
  • This filter must be used in conjunction with a Baader Herschel Wedge or Baader AstroSolar Safety Film for solar observations otherwise eye or equipment damage may occur.
  • Planeoptically polished, non-ageing sealed coating edges.

Successor version:  Baader 7.5nm Solar Continuum Filter (540nm) (various versions available)

The previous Baader Solar Vontinuum Filter are no longer produced. Compared to the previous model with 10 nm half-band-width, the new Baader Solar Continuum Filter has a half-band-width of only 7.5 nm, which once again significantly increases the contrast. This replaces both the previous 10 nm Solar Continuum filter and, for the first time, the stacked 1¼" filter #2458392.

A prototype of the Baader 7.5nm Solar Continuum Filter has already been tested. Check out the test report here.

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€ 85.00 Price excl. German VAT tax (19%): € 71.43

Product Questions and Answers

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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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Does the Solar Continuum filter block or transmit Infra red or UV?
Question by: Chris. S. on Feb 26, 2021 12:32:00 PM | 1 Answer(s)

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I have bought this filter but not yet tried it. Soon I will do imaging of the sun with my Celestron Neximage 5 + APO 2x Barlow and my OTA, Celestron C8" XLT.
I have also bought your AstroSolar Safety Film and will use it in front of the C8".
Is this enough for imaging of the sun or will it be too warm and harm my equipment?
Friends of mine have said that it is also needed to add an extra IR filter to reduce the heat, but this is something I haven't read from you in Baader. Maybe it's some amateur's ideas without the correct knowledge.
I have bought many things from you and think you are one of the best optic manufacturers in the world. I really trust your skills and your products.
So before I start imaging the sun, it's better to ask you for good advice instead of destroying my equipment. :-)
Bo Sundin aus Schweden
Question by: Bo Sundin on May 12, 2021 11:51:00 AM | 1 Answer(s)

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I have solar spectrum HA filter 0.3A. Will this Continuum filter improve the sun’s contrast visually? Thank you
Question by: Gary on Nov 15, 2022 10:09:00 PM | 1 Answer(s)

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Can you buy two Solar Continuum Filters separately and stack them, without needing to purchase the double-stacked version? Will the double-stacked Solar Continuum Filter work with an unmodified DSLR camera?
Question by: Nicole Sharp on Sep 29, 2019 1:16:00 PM | 1 Answer(s)

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Baader Narrowband Filers in sizes 1¼", 2", 50.4mm and 50x50mm

Double Stacked Solar Continuum Filter - For Visual and Photographic Observations of the Sun

Ensures highest contrast in the photosphere of the sun. The filter works as a monochrometer - suppressing the effects of the atmospheric turbulence and results in images that are significantly sharper. Owners of SCTs and refractors will benefit as red and blue wavelengths are completely excluded, with the transmission area peaking at 535nm where telescope optics are sharpest and free from chromatic aberrations.

Important Information for Solar Observing

The Solar Continuum Filter may be used for purely VISUAL observation ONLY in conjunction with the Baader Herschel Prism or with the Baader AstroSolar Safety Film (ND 5.0).

The combination of AstroSolar Photo Film (ND 3.8) and Solar Continuum filter is used exclusively for photography of the sun at high magnifications. This combination is highly apt to capture the finest solar surface detail and granulation at extremely high magnification while enabling ultra-short exposure (measured in milliseconds) in order to freeze atmospheric turbulence.

Customer Examples:

Three sample images, taken by Olivier Grattepanche. Mr Grattenpanche writes:

Instrument: "TSC 225 Schmidt-Cassegrain from TAKAHASHI, NJP160 mount, F/40 with 2X Big Barlow Tele-vue, NGFs focuser, and of course your incredible Baader Astrosolar filter D:3.8, IR cut filter and Continuum filter"
partielle Sonnenfinsternis
VestaPro with 1/3" black and white sensor ...
... 800 frames stacked with IRIS ...
... Colors were added afterwards for aesthetical purpose
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4 Item(s)

Marco Heeg 252/09/2022 10/09/202213:45
  • Rating:
Solar Contiuum Filter 540 nm mit kleiner Ausrüstung
Hallo und Guten Tag ...
Ich möchte mit meinem Beitrag kurz aufzeigen wie gut der Baader Continuum 540nm Filter und die Baader Sonnenfilterfolie in Verbindung mit der Baader 2.25 Barlowlinse auch mit kleiner Ausrüstung ( Optik und Kamera ) zu verwenden sind. Auch so gelingen ( wie ich finde ) sehr brauchbare Beobachtungen / Ablichtungen der Sonne.
Aufnahmedetail finden sich je in der Fotounterschrift.
Marco Heeg
  • Sie sind alle preiswert und gut.
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Bob Y 212/08/2021 01/08/202116:43
  • Rating:
Continuum filter
Excellent for visual, and with IR blocking filter for imaging. Images taken with ED100/900 at 900 and 1800 mm FL, Herschel edge, PGR (FLIR) Chameleon CCD camera.
  • Outstanding contrast.
  • Nothing.
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Bob 350/12/2020 16/12/202011:13
  • Rating:
Solar Continuum filter
My preferred filter for critical viewing and high-contrast imaging of the photosphere.
  • Contrast. Makes a nice combination with an H alpha for side-by-side viewing.
  • Nothing.
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Eddgie 03/01/2017 04/01/201722:00
  • Rating:
I use the Solar Continuum almost exclusively
I use the Solar Continuum (SC) almost exclusively.

Here is the "Theory" behind the SC filter. The photosphere of the sun is obscured by the gases above it (the chromosphere). The Chromosphere is only about 10,000 miles deep, but it is red and it obscures the yellower light coming from the surface.

The SC filter is tuned to cut this red so that it does not obscure the photosphere to the same degree as it would without it.

That is the theory. Here is my own experience but it gets technical. Filters block energy and because of this, to get something you loose something.

The SC is amazing for seeing four different classes of features. the first is the structure of the fingers in the penumbra of sunspots. I can easily see more fine detail using the SC than without it, but only when seeing steadies and power is high (I use zooms exclusively for this reason... So I can amp up when I see that seeing has steadied). The second area is pores. I see them with much more authority when using the SC. The third is granularity. Great in white light using wedge of film, but better when using SC. Last is faclula near the limb of the sun. . With the SC, they really jump out!!!

Downside. Because it is tuned more to the photosphere, when you look into the center of a sunspot (bridges) you won't see some of the detail inside the sunspot with the same authority. Bridges and light islands are sometimes ejections into the chromosphere (bridges are often arches but we see them looking down so we can't tell that at the eyepiece.) You can still see bridges and arches, but they won't stand out out as well with the SC in place. I have observed bridges as being wider and softer without the SC (the parts that are closer to us no doubt) and light islands inside the umbra will seem to be less well defined. I can sometimes see light islands with no SC that are invisible with the SC, and again, this is because these are actually I think more of where the "Steam" is sitting just above the surface. (At least I think this is what is happening but admit to the possibility of being mistaken).

Here is an image that shows the kind of detail I can see inside the sunspot that without the SC that is dulled by the SC, but the fingers around the sunspot are greatly enhanced.


And if using an Achromat, SC turns it into a solar Apo.

I highly recommend SC. I have used a lot of "Magic" filters over the decades that did not really seem to do nearly as much as I had read they would do, but the SC is in a class by itself. Outstanding for studying anything but the detail in the Umbra of sunspots. If you are looking and see light islands, you can yank the SC to study them and see fainter ones sometimes that you can't see with the filter in place.
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