Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp

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Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp

# 2456117

€ 438.65 Price excl. German VAT tax (16%): € 378.15

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  • 2" BBHS prism star diagonal (BaK4 glass) with 2" ClickLock clamp and black case.
  • 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
  • Provides greatest reflectance over most spectral range from 390 to 2000nm
  • BBHS = Broadband Hardsilver coating with dielectric protective overcoating
  • Much higher in brilliance than cheap dielectric coatings

Product Questions

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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)
PRISM-2Z 2456117 (2 inch diagonal with zeiss prism) I have a Celestron Evolution 9.25, with 2" visual back. Can I remove the nose piece and screw this diagonal directly onto my 2" visual back and use the lock ring LRING 2458270? Thank you. Jeff
Question by: Jeff Melcher on May 28, 2018 5:36:00 PM | 1 Answer(s)
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)
Is the prism in this diagonal (#2456117) a Carl Zeiss spec prism?
Question by: Brian on Jul 12, 2017 4:56:00 PM | 1 Answer(s)
What is the outside diameter of the nose piece? The precise inside diameter of the focusing tube on my refractor is 2.000 inches at 20 degrees Celsius +/- 0.001 inches. If it turns out that the nose piece is also exactly 2 inches, I could turn the nosepiece on a lathe. Your thoughts? What nose piece diameter would you suggest, if I had to turn it on a lathe?
Question by: John Aviste on Oct 12, 2016 9:30:00 PM | 1 Answer(s)
Does the diagonal have an eyepiece stop?
Question by: Jan on May 25, 2018 5:17:00 PM | 1 Answer(s)
How come the BBHS 2" Prism ClickLock diagonal has 100mm optical tube legnth, while the seemingly identical mirror BBHS diagonal has 112mm? Is that an error?
Question by: Jan on May 25, 2018 4:19:00 PM | 1 Answer(s)
I already purchased this beautiful prism. Now I would like to attach the Giant Bino Mark V. How can this be done directly? With a 2"-Quick Changer ? If not yet, will you make them soon?
Or better: a Self Centering Adapter version ClickLock-QuickChanger. 2" and T2.
Question by: Arthur on Dec 28, 2016 4:28:00 PM | 1 Answer(s)
Do the Baader prism diagonals with BBHS coating work well with refractors faster than f/7 or f/8? I am wondering if chromatic aberration (or spherochromatism) would be a problem as the light propagates through the glass prism.
Question by: Brian on Jul 13, 2017 4:00:00 PM | 1 Answer(s)
Does the 2" nose-piece accept standard 2" filters such as Lumicon UHC? If not, what adaptor would i need?
Question by: John on Nov 17, 2016 1:23:00 AM | 1 Answer(s)
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Additional Information

Manufacturer Baader Planetarium
SKU (#) 2456117
Weight (kg) 0.513
Optical Design Star Diagonal 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 BBHS coated, Dielectrically protected
AR-Coating Phantom Coating® Group
Image Orientation Erect image, Mirror inverted
Optical length (mm) 100
Clamping System ClickLock
Deflection angle 90°
Inner Diameter / Clear Aperture (mm) 47.5

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Mike 39/02/2016 09/02/201611:22
  • Rating:
Excellent piece of kit
Premium prism diagonal delivers excellent performance with the security of ClickLock.
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