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Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp

Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp

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Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp

# 2456115

€ 414.28 Price excl. German VAT tax (16%): € 357.14

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Manual and Recommended Use: Baader Star Diagonals(T-2 and 2")

2" BBHS star diagonal with 2" ClickLock terminal and black case. Provides greatest reflectance over most spectral range from 390 to 2000nm
New included item since 01/2020: Baader 2" Safety Kerf nosepiece with 2" filter thread (#2408156, € 34,12) with additional grip and security from inadvertent slipping. This 2" nosepiece replace the former included 2" standard clamp with undercut
Much higher in brilliance than standard dielectric coatings
BBHS = Broadband Hardsilver coating with dielectric protective overcoating
T-2 BBHS-Sitall zenith mirrors on both sides with T-2 Photo thread

Product Questions

Tell me, please, what is the best diagonal to choose for observing objects of distant cosmos and planets:
Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp
Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp
And yet, the mass of them is indicated the same, is there any error here? The prism should be heavier? Thank you for your responses!

Question by: Evgeniy on Mar 28, 2017 8:13:00 PM | 1 Answer(s)

There was indeed an error in the specs, the mirror weighs 451g and the prisms weighs 513g. Regarding your question which to choose:
Usually prism diagonals are better suited for long focal length refractors and mirror diagonals for short focal length mirror telescopes.
This is because the total reflection with prisms is suboptimal when using short focal lengths due to nonlinear light reduction with high angle side light rays and chromatic prism effects. Also there are shifts in backfocus and it can influence the correction of high quality optics due to the glasspath (the speed of light is lower inside a dense medium like glass in comparison to air).
On the other side mirrors don't have the same maximum reflection values like a prism's lossless physical total reflection. Also a mirror is much more sensitive to transmission reduction when exposed to the air (sensitive silver layer getting weak very soon).
But with the Baader BBHS self protecting silver reflection layer on both diagonals (mirror and prism) the backsides of both principles are well compensated, this means the mirror diagonal will not loose any light due to aging anymore and the general light angle sensitivity of the prism diagonal due to reliance on total reflection alone is compensated by the additional BBHS layer below the total reflection hypotenuse area.
So the decision between diagonal mirror or prism is not as critical as it was until now.
But still a short focal length instrument favours a mirror diagonal.

Answer by: Baader Web Team (Admin) on Mar 29, 2017 10:49:00 AM

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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)

BBHS-mirror coatings require the same care during cleaning as you would give to the protected aluminum-coatings of a Newtonian telescope. Only dielectric coatings have the ultimate hardness to withstand any kind of mistreatment during a cleaning procedure - very similar to our Phantom-Group hard antireflection coatings applied onto our lens surfaces.

Any reflecting telescope with classic coatings can attain a lifetime of 20 or 30 years - correct handling provided. The same accounts for our protected silver-coatings, whereas the position of a stardiagonal within the optical train does provide much better protection against environmental influences, compared to the exposed surface of a primary telescope mirror.

We do regard the benefit of the BBHS hardsilver coating to be quite noticeable, compared to the reduced spectral range offered by a dielectric coating. Please check in the Internet for statements that would verify our position. Or look for the very extensive tests on star diagonals, performed by William Paolini (see tab "Downloads".

Please read more on the properties of our star diagonals and our design philosophy here: http://www.baader-planetarium.com/en/blog/baader-bbhs-reflective-properties/

Answer by: Baader Web Team (Admin) on Sep 15, 2016 8:22:00 AM

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What is the best diagonal for a F10 SCT (Celestron 9.25 Evolution):
Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp
Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp
If a focal Reducer/Corrector f/6.3 is used does the recomended diagonal change?
Thanks

Question by: Antonio Vilela on Jan 26, 2019 1:20:00 PM | 1 Answer(s)

Can this diagonal be threaded direct to the 2" SCT back using the locking ring?

Question by: Mauricio on Jun 24, 2019 11:20:00 PM | 1 Answer(s)

Is your mirror coated on the front of the glass on your Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp? As in a front surface mirror? Thank you! David

Question by: David on Sep 20, 2018 12:11:00 AM | 1 Answer(s)

What diagonal would you recommend for a Takahashi TSA-102 (fl 816mm / F/8) a Baader 2" BBHS ® Mirror Diagonal or Baader 2" BBHS ® Prism Diagonal?

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Question by: Ronald Bemelmans on Jan 30, 2020 9:57:00 PM | 1 Answer(s)

I have a 1984 Celestron C11 and wish to use one of you Badder diagonals. Can I thread a Celestron focal reducer on to your diagonal or to the Badder adapter that fits my C11?

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Question by: James A. Gibbs on Apr 5, 2019 3:54:00 AM | 1 Answer(s)

What's the easiest way to attach the "Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp" to Televue NP127is and keeping the optical path shortest for Denkmeier Binotron 27 system?

Is there also a way how to add UFC to the path and keep somehow ClickLock detachable for the bino vs single eyepiece use?

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Question by: Jan Somr on Jun 29, 2020 3:42:00 PM | 1 Answer(s)

You can replace the 2" Clicklock with Baader Adapter 2" (male) / T-2 (male) # 1508035, then you have a male T-2-thread at the end of the star diagonal. Here, you can either directly attach a binoviewer with female T-2-thread, or use a T-2 quickchanger (# 2456313A or # 2456313), if it has the Zeiss micro-bayonet dovetail. If your bino-viewer should have a female 2"/SC-thread, you can use Baader 2"/2" Inverter Ring with 48mm filter thread # 1508020 instead - I can't find an info about which threads the Denkmeier offers.

To connect the UFC to one of our 2" star diagonals, you can e.g. remove the 2" nosepiece. It has got a male SC-thread, the body a female SC-thread. Then you need
1x Baader UFC S70 / 2" SC-thread (f) Telescope-Adapter (optical height: 1 mm) # 2459128
1x Baader UFC Base (Filter Chamber) telescope-sided S70 dovetail receptor (optical height: 13 mm) # 2459110
1x Baader UFC 2" (m) SC Camera-Adapter (optical height: 2 mm) # 2459120
plus the filter sliders. This adds 16mm to the length.

Depending on the threads at the focuser of your telescope, it may be possible to connect the star diagonal via the SC-thread – but then, you can't rotate it easily into a convenient position, so this would be only recommended for telescopes on an alt-az mount.

Answer by: Baader Web Team (Admin) on Jun 30, 2020 2:02:00 PM

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Does the 2" nose-piece accept standard 2" filters such as Lumicon UHC? If not, what adaptor would i need?

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Question by: John on Nov 17, 2016 1:23:00 AM | 1 Answer(s)

Can I use an UV/IR-Cut filter or the BBHS mirror in front of an H-Alpha or Calcium Solar Filter? Do you recommend the 2" BBHS or 2" Clicklock Mirror for solar observation?

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Question by: Enrique V. on Sep 26, 2016 3:04:00 PM | 1 Answer(s)

If you want to observe the sun in H-Alpha, we recommend the standard dielectrical Clicklock mirror (# 2956100) in combination with a suitable filter combination, because the dielectrical filter reflects less radiation below 380nm and above 740nm. This way, the mirror can reduce the strain on the following filters at least a little bit.Please do also use an energy rejection filter in front of the telescope to reduce the strain on the filters as much as possible.

We highly advise against visual calcium observations of the sun - the 397nm of Calcium are already ultraviolet radiation, and UV-radiation can cause phototoxic reactions which can harm your eyes. In addition, even young people can't see these wavelengths very good, and sensitivity decreases with the age. Because of this, the eye doesn't feel if the intensity is much too high. If you now try to increase the amount of radiation (e.g. with another mirror) to achieve a brighter image, you will increase the risk for eye damage. According to the newest norms for eye safety and to ophtalmologist conclusions, the sun must not be observed visualy at 397nm.

We highly advise to only observe the sun in calcium photographically, then you also do not need a star diagonal. We can't understand why some manufacturers promote these calcium-filters for visual observations.

We also advise against placing a filter so close to the focus - any energy rejection filter belongs in front of the front lens, even if this sets high demands to the quality of such a large filter. Placing the filter close to the focus will save money, because you can use a much smaller filter, be we absolutely can't recommend it - because of our own conscience as well as because of EU-regulations. The filter would receive all the energy collected by the front lens. We can only recommend putting the energy rejection in front of the front lens, which is the ethically and technically correct method.

Answer by: Baader Web Team (Admin) on Oct 14, 2016 9:32:00 AM

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Related Articles

Optical tube lengths of 2" Clicklock and BBHS mirror diagonals

Recently we received the following questions on our 2" Clicklock Diagonal Mirror and wanted to answer including the below illustrations for other customers: Please note: all of the below information is also valid for our 2" BBHS mirror and prism diagonals (with slight differences in the specifiations such as optical tube lengths – please compare with specs on the product pages). According to image below is the optical path mentioned in technical data (112mm for #2956100 and 109mm for #2956100Z) measured along optical axis from point A to B or point A to C? what is the dimension from point B to C? Can 2” barrel (at point A) be removed from #2956100 and exchanged with another accessory (is it available?) to change the diagonal to #2956100Z (M68x1 thread)? Please note below our answer and adjusted graphic: The optical path of 112mm is measured A to C. The lightway from A to B would be ~71,5mm. Please note that the final endpoint of B is 3,5mm outside of the prism body (as illustrated in the below graphic), it looks just like point A in your drawing The Dimension from B to C (height of the SC-ClickLock) is 44mm. It is overlapping the...
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Overview and Recommended Use: Baader Star Diagonals

The most versatile tools: Baader Star Diagonals (T-2 and 2") Manual and Recommended Use A Baader star diagonal (both prisms and mirrors) can show you impressive images for a lifetime and offers more connection and configuration options than standard star diagonals. Baader Planetarium's star diagonals not only offer the highest mechanical and optical quality, but also have the additional advantage of being part of a large, modular system. They enable very short adaptations as well as threads for direct connections to a telescope or a Baader focuser, as well as adaptation to a wide range of threads for torsion-free use with heavy or long accessories, such as binoviewers. Decades of customer feedback led Baader Planetarium to create a seemingly overwhelming amount of adapters. But each adapter has its purpose. This is the reason why you can always find the optical length of each part in the product description, so that you can find the best solution for your needs. To get the most out of them, we recommend that you spend a few minutes reading this brochure. On the following pages you will find a guide on how to choose coating and star diagonal type an overview of the different...
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Baader BBHS ® reflective properties

Exclusively available on Baader Sitall Ceramic Mirrors and on selected Baader prism Star Diagonals: BBHS® reflection coatings predominantly are being utilised on our highest quality grade 2" BBHS® Sitall Stardiagonals (#2456115 – incl. black housing and 2" ClickLock clamp) as well as on the BBHS® T-2 Sitall Stardiagonal (#2456103) - where the housing features a male and female T-2 thread - for shortening the optical path with bino use, and to offer the utmost in adaptation variability as well as much more light throughput than with any conventional 1 1/4" star diagonal. BBHS® stands for Broad Band Hard Silver. When applied onto our Sitall (zero expansion glass-ceramics) substrates, these multiple deposited layers of hard silver are being sealed by a set of dielectric layers to achieve long term durability. With this advance in coating technology our BBHS® coating lifetime equals that of a high quality AlSiO2 coating, matching the durability of standard aluminium coated diagonals (and telescope mirrors) which have been in wide use for many years. The BBHS® spectral bandpass is much wider though, when comparing with our 50 layer all dielectric coatings utilized on the 2" ClickLock Star Diagonals. The all dielectric coating system on the 2" ClickLocks...
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Specifications

Additional Information

Manufacturer	Baader Planetarium
SKU (#)	2456115
Weight (kg)	0.444
Optical Design	Mirror Diagonal
Inner Connection (lens sided)	Thread, M48, M55, 2" (50,8mm)
Outer Connection (lens sided)	Barrel, Dovetail ring, S58, 2" (50,8mm)
Inner Connection (eyepiece/-camera-sided)	Thread, Clamp, M55, 2" (50,8mm)
Reflection surface	BBHS coated, Dielectrically protected
Image Orientation	Erect image, Mirror inverted
Optical length (mm)	112
Clamping System	ClickLock
Deflection angle	90°
Inner Diameter / Clear Aperture (mm)	47.5

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