Baader Prism Diagonal T-2/90° 32mm

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Baader Prism Diagonal T-2/90° 32mm

# 2456005

€ 95.00 Price excl. German VAT tax (19%): € 79.83

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Zenith Prisma T-2/90 ° with 32mm Prism
Connection objective side: T-2 internal thread
Connection eyepiece: T-2 external thread
Excellent for Baader Maxbright binoviewer

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Product Questions

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.

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Question by: Max Harrell on Jan 25, 2017 11:13:00 PM | 1 Answer(s)

The 32mm star diagonal (#2456005) is produced in the regular way - just like prisms are being made since four hundred years - without ANY coating applied onto the hypothenuse (reflecting) face. Please also check our website, nowhere do we state that this star diagonal would feature our BBHS-coating.

Any beam of light that will hit that uncoated surface under exactly 45° of incoming angle will undergo a "total reflection" (as soon as there would be a regular antireflection coating applied onto that reflective face, the performance would suffer greately). For ages Carl Zeiss had preferred the total reflection of prisms versus the reflective surfaces of mirrors, because until recently mirrors did tend to age (produce haze) very quickly.

For the BBHS T-2 prisms we needed perfect reflection also for very short focus telescopes and we wanted to produce a prism that could be used for a wide range of purposes - also for other reflective angles than exactly 45°. In this sense the BBHS-coating applied onto the T-2 prisms offers "another league" of functionality - and the hard silver coating will keep this optical surface to stay clean for ages, whereas the open glass surface of the 32 mm prism will be prone to collect some dust or even dew over time.

Still the 32mm prism is mounted within a precision metal housing, suitable to carry the weight of the Maxbright and heavier binocular viewers asf. It offers the very shortest light path for attaching - say - a Maxbright Bino onto any telescope due to its T-threads. In this way we regard it as a very good solution for any low-cost binocular viewer, since the optical polish of the prism faces is made very precise, with the extended optical distance in mind that adds itself into the light path when putting the added mechanical length of a binoviewer between the 90° prism and the eyepiece focal plane. Regular 90° prisms often feature a plastic housing and are only made to supply sufficient optical quality for an eyepiece to be mounted directly atop such a prism face.

Conclusion: each of these two prisms (32mm as well as BBHS T-2) are top performers within their respective price range. And if you plan to ever use a Mark V Binoviewer, the T-2 BBHS prism will be the first and most useful investment for an undeteriorated viewing experience.

Read also more on Baader BBHS Reflective Properties:
http://www.baader-planetarium.com/en/blog/baader-bbhs-reflective-properties/

Answer by: Baader Web Team (Admin) on Jan 26, 2017 11:01:00 AM

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I would like to know if I can screw in my Takahashi Extender-Q directly into this prism diagonal or would I need an additional adapter.
Thank you.

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Question by: Michael Millan on Jul 24, 2017 9:38:00 PM | 1 Answer(s)

I am interested in using the T-2 32 mm prism diagonal on my Orion ED80 f7.5 600mm f.l. refractor (bought in 2009). It has a 2" Craford focuser that I would attach it to. I would like to know what adapter I need to attach it to the focuser?

The focuser comes with a long 2" eyepiece holder that I want to remove to reduce the focal distance to the point of attachment to the focuser. That leaves the focuser's exterior threads exposed. The exposed threaded tube's dimensions are: ID = 2" OD = 2-1/8" exposed length is 3/8". I can't find a spec on the threads. but I count 10 threads in that 3/8".

My goal is to gain inward focus, increase contrast and clarity, and convert to the clicklock eyepiece holder. My largest eyepiece is a 32mm Optiluxe. As light conditions limit to planetary, I doubt I would get a longer f.l. eyepiece.

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Question by: Stephen Jackson on Apr 13, 2018 5:58:00 PM | 2 Answer(s)

Specifications

Additional Information

Manufacturer	Baader Planetarium
SKU (#)	2456005
Weight (kg)	0.16
Optical Design	Star Diagonal Prism
Inner Connection (lens sided)	Thread, T-2 (M42 x 0,75)
Inner Connection (eyepiece/-camera-sided)	Thread, M34
Outer Connection (eyepiece/-camera-sided)	Thread, T-2 (M42 x 0,75)
Reflection surface	Total reflection
AR-Coating	High transmission multi-coated (HT-MC)
Image Orientation	Erect image, Mirror inverted
Optical length (mm)	35
Clamping System	no clamp
Deflection angle	90°
Inner Diameter / Clear Aperture (mm)	32

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