Baader 2" Amici-erecting-prism 90° with 2" holder and 2" sleeve

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Baader 2" Amici-erecting-prism 90° with 2" holder and 2" sleeve

# 2956152

€ 292.00 Price excl. German VAT tax (19%): € 245.38

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  • 90 ° Amici-erecting-prism with 2 "eyepiece and 2" barrel
  • Including Reduction 2 "to 1¼"
  • Excellent for terrestrial viewing with 2 "eyepieces
  • Not suitable for high magnification - for high quality astronomical images with high magnification using better our mirrors and prisms

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I have some questions regarding your Amici-prism 2" diagonal:

1. Does it really have only 30 mm clear aperture? Is it not too small for 2" eyepieces like Nagler 31 mm (42 mm fieldstop)? No vignetting?

2. What is the length of the light path in this diagonal?

3. I'm thinking about using this diagonal in a 80/400 refractor, with Teleskop-Service flattener TSFlat2 (, which has normal 2" filter thread. Can the nosepiece of the diagonal be unscrewed, and the flattener screwed to the body of the diagonal itself? (so the flattener would work as a nosepiece). In the description there is the information that "innenanschluss" is M48 thread, and this - I think - is equal to standard 2" filter thread...
Kind regards, Piotr Kierzkowski
Question by: Piotr Kierzkowski on Nov 9, 2016 10:31:00 AM | 1 Answer(s)

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For the prism 2956152 it states that it isn't for high magnification. On an American website however, High Point Scientific, for this model it states that "Correct image diagonals have been used traditionally for terrestrial viewing, and limited to low (under 100X) magnifications. The high quality of this diagonal lets you use much higher magnifications without aberrations or image breakdown". Would this information be incorrect? Many thanks
Question by: Graham on Jul 27, 2020 6:20:00 PM | 1 Answer(s)

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I would like clarification on the threads / interfaces with the prism holder body. You state the Lens Side has both an inner connection that is M48-.75mm thread and an outer connection 2" barrel....does the 2" barrel screw into the M48-.75mm thread in the prism holder body? or is the interior of the 2" barrel threaded with M48-.75mm? On the Eyepiece side, is the clamp removable at all? Is it threaded in or pressed fit in? If either, please specify. Do you have a CAD model of the assembly you can share?
Thanks, James Riall
Question by: James Riall on Jul 3, 2017 9:24:12 PM | 1 Answer(s)

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The top of the nosepiece is has an M48-thread for 2" accessories. Inside the nosepiece, its inner diameter narrows; there is a visible inner ridge in the photos. Is this second diameter a standard size (T2 etc) and is it threaded?
Question by: Mark on Mar 10, 2021 7:20:00 AM | 1 Answer(s)

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Re # 2456120 You state : Prism not suited for high magnification.
Where do you draw the line ?
Is a good quality refractor 150 mm still ok to use with
the prism # 2456120 ?
Your advise appriciated Regards Fred Janssen
Question by: Fred Janssen on Jul 14, 2018 12:03:00 PM | 1 Answer(s)

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90° mit 2" Okularaufnahme und 2" Steckhülse, inklusive Reduzierhülse 2" auf 1¼". Hervorragend geeignet für die terrestrische Beobachtung mit 2" Okularen. Nicht für hohe Vergrößerungen geeignet – für qualitativ hochwertige astronomische Bilder mit hoher Vergrößerung verwenden Sie besser unsere Spiegel und normale Prismen, oder das Amici-Dachkantprisma # 2456120, da die Dachkante den sog. "split" Effekt und der lange Lichtweg einen Farbfehler erzeugt

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Additional Information

Manufacturer Baader Planetarium
SKU (#) 2956152
EAN Code 4047825024596
Net weight (kg) 0.56
Optical Design Erecting Prism
Inner Connection (lens sided) M48
Outer Connection (lens sided) ø 2" (50.8mm)
Inner Connection (eyepiece/-camera-sided) ø 1¼" (31.75 mm), ø 2" (50.8mm)
Reflection surface Total reflection
AR-Coating Multi-Coated (MC)
Image Orientation Erect image, Non-reversed
Optical length (mm) 99 mm with 2" barrel; with 1,25"-reducer additional 10 mm
Deflection angle 90°
Inner Diameter / Clear Aperture (mm) 38

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