Baader T-2 Stardiagonal (Zeiss) Prism with BBHS ® coating (T-2 part #01B)

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Baader T-2 Stardiagonal (Zeiss) Prism with BBHS ® coating (T-2 part #01B)

# 2456095

€ 243.00 Price excl. German VAT tax (19%): € 204.20

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  • T-2/90 ° diagonal prism (BaK4 glass) with 35mm free aperture terminal objective side: 2 "or 1¼"
  • Connection eyepiece: 1¼ "
  • Prism made in accordance to Zeiss-norms, multi-coated, solid metal case, both sides T-2 connection threads, resulting in extremely short design and adaptable to each telescope system.
  • Not just the housing is significantly better and the prism is greater, also the planarity and the conformality of the prism faces are about 5x better than standard prisms in plastic housings.

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Is this the smallest of its kind of 2 diagonals?
Question by: Alexandr Martynov on Dec 1, 2021 3:26:00 PM | 1 Answer(s)

Rating of Question

33
Does it make sense to use a T2-2" clicklock on this for a 2" eyepiece? Or it's better to just use 1.25" clickclock and eyepiece given the connection interface size is only T2.
Question by: Howard on Nov 3, 2017 4:14:00 AM | 1 Answer(s)

Rating of Question

16
Are the BBHS coatings easy to clean? Do the coatings have a life comparable to your dielectric coatings? Do the coatings degrade over time and at what rate? Is there a difference in performance between your dielectric diagonal and the BBHS one, what are the differences and are they significant or very slight? I own an early Televue APO 4 inch refractor.
Question by: John on Sep 9, 2016 1:29:00 AM | 1 Answer(s)

Rating of Question

12
Is it possible to unscrew/remove the male T-2 thread on the prism diagonal, thereby exposing a female thread? I would dearly love a T-2 prism diagonal with female threads on both ends...
Question by: Mort on Nov 18, 2021 6:31:00 PM | 1 Answer(s)

Rating of Question

9
Would this fit well a Mewlon 210 with an attached SteelTrack focuser, to be used with TeleVue 2” eyepieces?
What other parts would I need to be able to mount it (and rotate it) on the focuser?
Question by: Alex Georoceanu on Sep 13, 2023 10:28:00 PM | 2 Answer(s)

Rating of Question

7
Hello! Can I photograph through this 2" diagonal if I have an APS-C matrix?
Question by: Alexandr on Nov 27, 2021 4:50:00 PM | 1 Answer(s)

Rating of Question

7
Is the male T2 threaded adapter (or equivalent) that is found on the eyepiece side of this diagonal available separately?
Question by: Manoj Sood on Dec 17, 2023 7:15:00 AM | 1 Answer(s)

Rating of Question

1
I have a Baader 2" Clickclock diagonal mirror. Can I remove the 2" Clicklock from that diagonal and attach it to the T-2 Ziess prism diagonal?
Question by: Matt on Oct 3, 2019 6:56:00 PM | 1 Answer(s)

Rating of Question

-6
I have an application where I need the male and female threads swapped. Will it work if I turn the prism diagonal around and send light through in the opposite direction? (The light would be entering the end of the prism diagonal that has the male T2 thread.)
Question by: Mort on Nov 17, 2021 9:12:00 PM | 1 Answer(s)

Rating of Question

-12
After a few years of using the Zeiss T2 diagonal, I am fully satisfied with its modularity and the result on TV-85mm.
I was wondering what is the light transmission rate (99% reflectance for T-2 Maxbright Mirror) nothing indicated for the T-2 Stardiagonal (Zeiss)?
Question by: yann on Nov 7, 2021 6:01:00 PM | 1 Answer(s)

Rating of Question

-15
Dear Baader for my dobson 18' f4 do you suggest to use the T2 zeiss prism diagonal or the T2 mirror? I mostly observe planets hires more then deep sky objects. I was thinking to prism due to future binoviewer but I heard prism could be an issue on a fast f4 scope for bad correction
Question by: Jack on Sep 4, 2018 11:00:00 AM | 1 Answer(s)

Rating of Question

-17
I would like to know if the Baader Planetarium Prism T2 Diagonal 32mm MaxBright (#2456005) and also the Baader Planetarium StarDiagonal Prism T2/90 ( #2456095 ) have the BBHS silver coating on the prism ? I have ask about this here in the states but no one seems to know the answer.
Question by: Max Harrell on Jan 25, 2017 11:13:00 PM | 1 Answer(s)

Rating of Question

-17
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Specifications

Additional Information

Manufacturer Baader Planetarium
SKU (#) 2456095
EAN Code 4047825011299
Net weight (kg) 0.17
Optical Design Star Diagonal Prism
Inner Connection (lens sided) M42 x 0.75 (T-2)
Inner Connection (eyepiece/-camera-sided) M34
Outer Connection (eyepiece/-camera-sided) M42 x 0.75 (T-2)
Reflection surface Sealed BBHS coating
Glas path 36 mm
AR-Coating Phantom Coating® Group
Image Orientation Erect image, Mirror inverted
Optical length (mm) 38,5
Clamping System no clamp
Deflection angle 90°
Inner Diameter / Clear Aperture (mm) 34
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Hans-Christian 322/11/2020 18/11/202013:05
  • Rating:
Visual Back für Takahashi Mewlon
Die Takahashi Mewlons (180 und 210) haben ja einen recht geringen Backfokus und nutzen ein ziemlich "einmaliges" Anschlußgewinde. Für die visuelle Beobachtung habe ich aus Baader- Adaptern (#2558231,#2408150), Click-Lock-Klemmen (2x #2956272, #2956214) und dem BBHS-T2-Zenitprisma (#2456095) einen kompakten und sehr stabilen "Visual back" zusammengestellt, der mir die volle Flexibilität zur Nutzung von 1,25" und 2" Okularen bietet und sicher auch für die Planetenfotografie taugt.

Ideal wäre es, wenn Baader für diese Anwendung (gilt auch für generelle SCs) einen Helikalfokussierer herausbringt, der mindestens die 36mm Durchlass vom Zenitprisma hat und sich nicht mitdreht. Damit läßt sich das Spiegelshifting komplett umgehen.
  • Entscheidend sind hier der große Durchlass des Zenitprismas und der geringe verbrauchte Lichtweg. Die Fertigungsqualität ist hervorragend, und die Optik ist gleichfalls über alle Zweifel erhaben (Eindruck am Mewlon 180C und an einem Vixen ED81s). Zu den Clicklock-Klemmen muß man nicht mehr viel sagen - absolut stabil und optimal in der Handhabung. Die Produkte sind in ihrer Art perfekt.
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Vielen Dank für Ihre positive Bewertung. Wir stimmen Ihrer Idee grundsätzlich zu und haben uns tatsächlich schon jahrelang mit der Idee der helikalen Fokussierer beschäftigt. Die Problematik liegt jedoch in den notwendigen Fertigungstoleranzen. Jeder uns bekannte helikale Fokussiermechanismus weist ein geringes Kippspiel auf. Und dann tauschen Sie folglich das Spiegelshifting durch das Kippspiel des Fokussierers aus, also quasi "den Teufel mit dem Belzebub". Aus diesem Grunde konnten wir uns mit den helikalen Fokussierern leider nie anfreunden. Sie können mit Sicherheit am Markt Helikalfokussierer finden, die zu Beginn keinerlei Spiel zeigen, jedoch wird die scheinbare Spielfreiheit in jedem uns bekannten Falle durch ein zähes Fett hergestellt, was bewirkt dass diese Auszüge mit der Zeit dann doch immer mehr Spiel bekommen.
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Marcus Z 172/06/2020 21/06/202016:04
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Sehr gutes Prisma!
Ein sehr gutes Zenitprisma! Durch die T2-Gewinde ist es vielseitig verwendbar. In meinem Falle mit einer Takahashi Okularklemme und variablen T2-Verlängerungshülsen, um den optischen Weg exakt auf einen Takahashi Extender einzustellen. Bezüglich der optischen Leistung ist es wie erwartet sehr gut.
  • universell einsetzbar
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