Baader Q-Barlow 1.3x/ 2.25x

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Baader Q-Barlow 1.3x/ 2.25x

# 2956185

€ 55.00 Price excl. German VAT tax (19%): € 46.22

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  • Baader Q-Barlow lense 2.25x, 1¼" barrel
  • dual factor lens assy (1.3x/ 2.25x)
  • Modern High-Transmission Multi-Coating all air-glass surfaces delivers a remarkably brilliant image with extremely low internal reflections
  • Extends the possible focal lengths of the Q-Turret eyepiece set

Product Questions and Answers

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I have three Baader Hyperion eyepieces 8mm, 13mm and 24 mm. Should I get this Barlow or the Hyperion zoom Barlow? I’m not planning on getting the zoom in the future but who knows what will really occur. Thanks!
Question by: Jeffrey Bisely on Mar 21, 2022 10:50:00 PM | 1 Answer(s)

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What is the focal length of the barlow or is the given magnification correct? I measured some photos and got different results.
Question by: Bent on Jun 20, 2022 9:02:00 AM | 1 Answer(s)

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Help – the Barlow does not fit into my 1.25" filter thread!
Question by: FAQ - Team Baader on Jan 10, 2023 9:07:00 AM | 1 Answer(s)

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will this barlow work with Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
Question by: darrell sanchez on Jan 15, 2021 8:42:00 PM | 1 Answer(s)

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Hello, can this be used in 1.3X configuration with the Morpheus 4.5 mm eye piece?
Question by: Peter on Dec 28, 2022 2:58:00 AM | 1 Answer(s)

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Please can you share the focal length of the q-barlow? Thanks
Question by: Enrico on Jun 2, 2020 10:54:00 PM | 1 Answer(s)

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1) Using the T2 part#05 extension tube with just the lens cell does one have to take into account the length of the filter thread to work out the amplification factor? If so, I've calculated that allowing a few mm for the thread the amplification would be approximately 1.75x. Have I got this correct please?

2) Using the extension tube with the complete Barlow and adding a few millimetres for the filter thread I make the amplification approximately 2.75x amplification. Is this correct please?

Many thanks.
Question by: Steve Burke on Oct 29, 2020 1:22:00 PM | 1 Answer(s)

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Dear Baader I have the q-barlow but the screwed into the eyepiece directly for 1.3x magnification is possible with any brand\kind of eyepiece or just with your classic orthos?
Question by: Sirio on Jul 17, 2018 11:09:00 AM | 1 Answer(s)

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 Baader Planetarium Q-Barlow 2,25x / 1,3x

Without the housing, the Barlow lens can be screwed either into the eyepiece revolver (for 2.25x magnification) or directly into an eyepiece (for 1.3x magnification)
The Q-Barlow lens can be unscrewed from the eyepiece adapter

This high-quality 2.25x Barlow made of exotic glasses provides the rare extension factor of 2.25x. So, there are no duplicate focal lengths when used with the eyepieces of the Q-Turret Set, and you can achieve higher magnification than with standard 2x barlow lenses if you do planetary photography with a web or video camera, and you can make better use of the camera's resolution. Read here the detailed report by Dipl.-Ing W. Paech: Hints + tricks for high-resolution lunar and planetary photography with a video module - a short "workflow" for SC telescopes with Baader accessories.

The Barlow can either be screwed into the Q-Turret eyepiece turret or combined via the special, included adapter with all 1.25 "eyepieces. In this case, it acts as a 2.25x Barlow. With the Q-turret revolver and the Classic Eyepieces, this results in the following focal lengths: 2.7 mm, 4.5 mm, 8 mm and 14 mm

Alternatively, it can also be screwed directly into an eyepiece and then increases the telescope focal length by a factor of 1.3. The Barlow element has an M28.5 male thread (corresponding to the filter thread of 1¼ "eyepieces), the housing has got a M28.5 female thread. The factor 1.3x is achieved when the Q-Barlow is completely screwed into the 24mm long push-in sleeve of an eyepiece whose field diaphragm lies 2mm inside the push-in sleeve. This corresponds to the design of our Classic Plössl/Ortho eyepieces; with other eyepiece designs, the magnification factor may vary slightly.

Attention: When fully screwed in, the Barlow element protrudes 13mm into the 1.25" plug-in sleeve. On eyepieces where lens elements in the 1.25" sleeve do not allow the Q-Barlow element to be screwed in, it can only be used in the 1.25" adapter with factor 2.25x. If necessary, you can use it on these eyepieces with the 18.5mm long 1¼" extension sleeve with 1¼" filter thread on both sides: Baader 1¼" - 31.8mm nosepiece extension with 1¼" filter thread on both sides (T-2 part #05) (#1905130 , € 19,-)

Use on a planetary camera

The bare lens mount of the 2.25x Q-Barlow lens (without the 1.25" eyepiece holder) can be screwed into every 1.25" filter thread. To do so, remove the lenses with their threaded mount from the rest of the housing. Without the eyepiece clamp, the Barlow has no longer an extension factor of 2.25x, but only of 1.3x (when it is screwed completely into the filter thread). The reason for this is the shorter distance between the lenses and the image plane.

It may be that you can't insert the lens mount completely into the filter thread, then the magnification factor is closer to 1.5x.

But if the 1.25" nose piece of a camera provides a M28.5 filter thread, you can usually insert the Barlow completely, and because of the shorter distance the provided factor is ca. 1.3x. This is intentional and was one of the aims of the design. At 2.25x, an image circle of 25 mm is provided free of vignetting, while the fully lit image circle at 1.3x is 13mm.

The Baader Barlow lenses at a glance

With currently five different barlow lenses in Baader Planetarium's product range, it is not easy to keep track of which model fulfils which function best.

Fluorite Flatfield Converter (FFC) / 3x-8x (#2458200 , € 730,-)

90mm field of view also for medium format cameras - uncompromising quality even for extreme enlargements.

Focus gain: depending on configuration about 1.5-2.6cm

Carl Zeiss 1¼" Abbe Barlow lens 2x (#1603321 , € 477,-)

Legendary Zeiss quality for the common magnification range between 2x and 3x (with additional T-2 extensions). With T-2 connection for cameras or eyepiece clamps. The qualitatively equivalent solution to the Fluorite FFC when smaller field size and smaller post-magnification are desired.

Focus gain: About 3 cm

VIP 2x modular barlow lens, visual and photographic (#2406101 , € 228,-)

Versatile barlow lens for magnifications from 2x, for use with cameras (via T-2 thread) and eyepieces. Calculated for 35mm image diagonal (full format). With additional T-2 extensions it can also be used for slightly higher magnification factors.

Focus gain at 2x: Approx. 3.3 cm

Baader Q-Barlow 1.3x/ 2.25x (#2956185 , € 55,-)

Inexpensive and amazingly high quality Barlow lens for the lower magnification range: In addition to being used as a normal Barlow lens with eyepiece clamp (with factor 2.25x), the Barlow element can also be used as a negative lens group when screwed directly into (almost) all eyepiece sleeves or directly in front of a camera with 1.25" filter thread and then provides a lower magnification of approximately 1.3x. Ideal for adapting a modern planetary camera to the resolution of an already long focal length telescope. Prerequisite: There must be no other elements in the nose piece that would prevent the approximeately 13 mm long Q-Barlow lens group from being screwed in.

Focus gain at 2.25x: About 0.4 cm

Hyperion Zoom 2.25x Barlow lens (#2956180 , € 133,-) Specially designed for the Hyperion Zoom eyepiece, also fits the filter thread of other eyepieces.

With the included T-2 adapter, it can also be used directly on cameras; provides about 2.7x at 55mm working distance and about 2.3x at 25mm.

Focus gain: About 1.1 cm

More information, images results...

... can be found on our detailed Blogpost:

Baader Blogpost:
Barlow lenses, their magnification factors and working distances

Baader Blogpost:
The camera at the eyepiece

Baader Blogpost:
The eyepiece series from Baader Planetarium

Related Articles

Additional Information

EAN Code 4047825027818
Manufacturer Baader Planetarium
SKU (#) 2956185
Net weight (kg) 0.07
Inner Connection (lens sided) M28.5
Outer Connection (lens sided) ø 1¼" (31.75 mm)
Outer Connection (eyepiece/-camera-sided) ø 1¼" (31.75 mm)
Clamping System Screw clamps
Magnification (x) 2,25x / 1,3x
AR-Coating High transmission multi-coated (HT-MC)
Adaptable to Q-Turret Okularrevolver und Classic Ortho/Plössl Okulare, 1¼ Okulare
Barrel Size (in) 1¼"
Optical Design Barlow
Speciality Barlow lens

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6 Item(s)

Zeibig 45/02/2024 15/02/202410:35
  • Rating:
Solide Verarbeitung, gute optische Qualität und schnelle Lieferung. Danke.
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Marc 43/02/2024 13/02/202400:50
  • Rating:
Leider dunkel und unscharf
Ich kombinierte diese Barlow mit weiteren Baader-Okularen wie 18er Ortho und habe weder tagsüber, noch nachts an hellen oder dunklen Gegenständen ein befriedigendes Bild am Teleskop. Der Jupiter wird zum Sonnenbrillenplanet.

Das Scharfstellen ist anstrengend, und ich weiss nie, ob es sich nun um den bestmöglichen Fokus handelt.

Die Stärkere Vergrößerung funktioniert gut mittels Herausziehen, aber das Bild bleibt unbefriedigend (Linsen sauber).

Trotzdem vergebe ich einen Punkt, da die 1,25-Vergrösserung eingeschraubt am Okular sehr gut ist.

Den Rest kann ich nur als Okularverlängerung eines Tages vielleicht anwenden.
  • 1.25 Vergrößerung
  • Alle Vergrößerungen über 2
Wir haben in den fast 10 Jahren, seitdem wir diese Barlowlinse anbieten, noch keine derartige Rückmeldung erhalten. Daher vermuten wir, dass es irgendwelche anderen Probleme in ihrem Setup gibt. Ohne weitere Informationen zu den verwendeten Instrumenten zu haben, können wir hier jedoch nicht wirklich weiter helfen.
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Helmut 198/07/2022 18/07/202206:02
  • Rating:
Klein aber fein
Preisgünstige Barlow-Linse die sich mehrfach einsetzen läßt. Ich nutze eigentlich nur den vorderen Linsenteil, der sich ideal in meine Okularkameras Skyris & NexImage 5 einschrauben läßt. Beim Mond vielleicht übertrieben aber sie soll diese Saison bei der Jagd auf Jupiter und Saturn helfen.
  • Die zweifache Verwendungsmöglichkeit: Im Ganzen, oder nur den vorderen Linsenteil
  • nichts
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Christoph Kaltseis 88/03/2021 30/03/202109:20
  • Rating:
Gassendi - x-trem
Die Baader Q-Barlow ist ein Kunstwerk - Preis / Leistung 1+++!
Das Bild ist mit dem C14 EHD f11 und der Q-Barlow bei etwas mehr als x2,25 aufgenommen.
Dazu die QHY 462C mit dem IR850nm Filter (= Luftglätter!)
Das sind 0,06" Bogensekunden pro Pixel ! Noch mehr - nein das sagt schon vieles... CS Christoph
  • Click Lock?
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Bernd 329/11/2020 25/11/202018:10
  • Rating:
Sehr gutes Preis Leistungsverhältnis
Rechtzeitig zur Mars Opposition 2020 habe ich mir noch schnell die Baader Q-Barlow Linse als Alternative zu der leider nicht lieferbaren Hyperion Barlow bestellt.

Das Produkt zeichnet sich durch ein sehr gutes Preis Leistungsverhältnis aus. Trotz des moderaten Preises ist die Abbildungsqualität hervorragend und so ist mir in Kombination der Q-Barlow mit meiner Planetenkamera QHY 5-III-462C eine schöne Aufnahme des roten Planeten gelungen.

Der einzige Schwachpunkt ist aus meiner Sicht die Okularklemmung:
Diese ist lediglich mit einer Schraube ausgestattet, die zudem keine durch Kunststoff entschärfte Spitze besitzt.

Für die Klemmung eines herkömmlichen Okulars mit Metallschaft stellt das sicherlich kein Problem dar, aber bei der empfindlichen eloxierten Oberfläche einer Planetenkamera muss man etwas aufpassen, wenn man keine dauerhaften Kratzer riskieren möchte. Ich habe das einfach mit einem Streifen Tesafilm gelöst.
  • Hervorragende Abbildungsqualität zu attraktivem Preis
  • Okularklemmung
    • @Bernd I agree about the screw. If it helps, I replaced the original screw with a nylon one. You need an M4 one.
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Michael 94/04/2019 05/04/201903:49
  • more than 5 year(s)
  • Rating:
Very nice quality and it works as it should
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