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Baader 2"/90° Astro Amici-Prism with BBHS ® coating

Baader 2"/90° Astro Amici-Prism with BBHS ® coating

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# 2456120

€ 595.00 Price excl. German VAT tax (19%): € 500.00

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3 Review(s) | Add Your Review

2" ClickLock-Clamp and 2" nosepiece.
Suited for astronomical observation at high magnification
Hard-silver-coated and protected against aging. Astro quality, manufactured by Zeiss standard

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Product Questions

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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Is it possible to have the same quality (suitable for hight magnifications) with an erecting capacity ?

Question by: Jean-Noël FERRIER on Sep 29, 2017 9:28:17 PM | 1 Answer(s)

What advantage does the amici have over the roof prism? Which is better for astronomy? which is better for terrestial?

Question by: Allan Smith on Mar 25, 2017 8:38:00 PM | 1 Answer(s)

Is a roof line spike visible using the 2" Baader Amici prism in the telescope at low or high power? I plan to use the prism for astrophotography and really need the short back focus that this diagonal provides.

Question by: Joel Cohen on Sep 12, 2019 11:20:00 PM | 1 Answer(s)

I have the 2456120 diagonal, and it's fine. However the Clicklock-SC clamp I use to fix the diagonal to my C9.25 SCT is too thick. What I really want is something with an SC-thread for the scope and on the other end, something to fit directly into the prism housing. Is there such a thing?

Question by: Bryan Dawson on Jul 15, 2018 10:37:00 PM | 1 Answer(s)

Related Articles

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 (#)	2456120
Optical Design	Erecting Prism
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	Sealed BBHS coating
Prism Glass (Type)	BK7
AR-Coating	Phantom Coating® Group
Image Orientation	Erect image, Non-reversed
Optical length (mm)	85
Clamping System	ClickLock
Deflection angle	90°
Inner Diameter / Clear Aperture (mm)	44

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