Baader K-Line Filter 1¼" (double stacked)

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Baader K-Line Filter 1¼" (double stacked)

# 2458355

€ 287.56 Price excl. German VAT tax (16%): € 247.90

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1

  • Warning: for photographic imaging only
  • for solar work use only with 3.8 AstroSolar 200x290mm Photo Film (included)
  • never use any eyepiece filter for solar observation without objective front filter
  • non-ageing sealed coating edges
  • Never look into the sun with the K-Line filter without an additional OD-reduction filter. For more information read the PDF Notes about the stacked 1¼" K-Line Filter

Product Questions

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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"?
105
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
What are the threads and pitch of your 1.25" and 2" filters?
30
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)
Hi, will this filter work with an unmodified Sony a6300 camera or do I need a modified sensor to register this wavelength?
6
Question by: Franco Meconi on Mar 20, 2019 4:12:00 AM | 1 Answer(s)
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Specifications

Additional Information

Manufacturer Baader Planetarium
SKU (#) 2458355
EAN Code 4047825009531
Weight (NETTO) 0.027
Transmission Range CaK-II
Filter Thickness (without cell) 2 mm
HBW (Halfbandwidth) 8nm
CWL (Central Wavelength) 394 nm
AR-Coating dielectrically coated, planeoptically polished
Special Features doube stacked
Filter size 1 25 inch
Filter Usage Solar
Filter mounted Mounted (classic 8mm)
Type of Filter Narrowband
Single or Set? Single Filter
Filter shape round
FAQ
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4 Item(s)

Michael S. 145/05/2020 25/05/202012:44
  • Rating:
Zweiter Einsatz des K-Line Filters
Nachdem ich eine Mail mit der Bitte um ein Feedback erhalten hatte, habe den Baader K-Line Filter im Zusammenspiel mit dem Baader Cool Ceramic Herschelkeil 4 Tage später (nach meiner ersten Bewertung hier) noch einmal ausprobiert und ein weiteres Mal hat er mich überzeugt. Obgleich aktuell auf der Sonne minimales Minimum zu beobachten ist, machte es Spaß die zarten, vorhandenen Fackelgebiete in der CaK und CaH Linie herauszuarbeiten und entsprechend den Wellenlängen von 393 + 396nm habe ich dann auch das Bild der Sonne passend eingefärbt.
;-)
  • Schöner Kontrast und wunderbare Alternative zum bekannten Solar Continuum Filter bei 540nm.
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Michael S. 138/05/2020 18/05/202020:16
  • Rating:
"First light" mit dem K-Line Filter
Habe in der vergangenen Woche den Filter erhalten und heute ergab sich kurz die Gelegenheit, eine halbstündige Wolkenlücke, den Filter im Zusammenspiel mit dem Baader Cool Ceramic Herschelprisma zu testen.
Es ergab sich ein Problem in der Zusammenarbeit mit meinem 4 Zoll APO Triplett mit 550mm nativer Brennweite, ich kam nicht in den Fokus, der volleingefahrene OAZ war noch immer eine Kleinigkeit zuviel an Abstand. Blieb nur die Linse von der 2.69x Düring-Barlow zu holen und an die 1.25 Zoll Nase der ZWO Asi Kamera zu befestigen, dann war fokussieren möglich, aber leider eben nicht mehr die Sonne voll im Bild zu haben.

Als Alternative blieb nur eine andere Kamera mit größerem Sensor zu nehmen, da Panos/Mosaikaufnahmen, insbesonders jetzt in der Minimum-Zeit der Sonne, nicht funktionieren, zuwenig Oberflächendetails anhand derer sich die Stitchprogramme orientieren könnten. Damit klappte es nun einwandfrei, ein 1.8ND-Filter und das Herschelprisma sorgten für ausreichende Lichtdämpfung, aber erlaubten noch immer sehr kurze Belichtungszeiten mit dem montierten K-Line Filter.
  • Das Produkt hält was es verspricht, schöner Kontrast auf der Oberfläche,.
  • Preis und die Möglichkeit die Sonne als Ganzes, formatfüllend abbilden zu können, fehlt.
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Greg K 228/08/2017 17/08/201706:04
  • Rating:
Finally I can do Calcium K imaging
Purchased this from a US dealer in the US and made a filter for the front of my C8 using the enclosed filter material. The filter and film are designed for PHOTOGRAPHIC USE ONLY, no visual use.

I have only done one test using the filter(s), the one you make that is a blocking filter on the front of the telescope and the Calcium K band filter which is attached in a 1.25 thread in front of a camera T-Mounted and placed in the eyepiece holder. I used a Point Grey Grasshopper 3 Five megapixel camera which is monochrome. The sun had some sunspot activity the first day I was able to test the filter and the filter brought out details in the image that were stunning. The image is likely better than any white light images I've taken but the front filter I created using the enclosed photographic film is a larger opening than my white light filters and photos have used. It's great to have a calcium K filter option that is affordable compared to older Calcium K telescopes. Baader also includes a warning in this, to NOT USE it visually. I figured it might be safe with Baader visual film and tried it with that film on a small scope but I think the Baader visual film blocks out the wavelengths that Calcium K could show. Most people cannot see Calcium K anyway and as Baader points out the Calcium K telescopes are dangerously close and radiation in that band is ikely dangerous to eyes anyway, So ALL CALCIUM K scopes should be used for photographic use ONLY, not just this filter.

  • Price and ease of use
  • Nothing, the product is great
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R. Tripa 297/10/2005 25/10/200508:49
  • Rating:
A good filter at a very good price
I want to congratulate you for having such a good filter at a very good price. Even if the sun was completely "clean" in white light, your CaK filter revealed some very nice detail. Please find in attachment an image of Monday's Eclipse (03.10.05) here in Portugal. You may use it at your discretion. Image Details: Camera: Atik ATK-16HR Exposure: 0.002s Telescope: TeleVue 85 Filters: Baader Photosolar film and Baader CaK filter.
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