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( 5 / 5 )
Product no.: 14172

1,25'' Amici Prism 90°

$ 169.00 incl. VAT, plus shipping costs
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Product description

More about the series Pro...

The Omegon 90° Amici prism very simply turns your astronomical telescope into a telescope suitable for nature observing!

Astronomical telescopes produce an inverted image. This is normally no problem when observing the night sky, but becomes a big problem if you every want to do any nature watching however. The Omegon 90° Amici prism provides the right solution. It re-inverts the image and also shows it non-reversed. In addition, it provides the observer with a 90° viewing angle, allowing comfortable viewing. This means any refractor, Schmidt-Cassegrain or Maksutov telescope can also be used for terrestrial observing.

Optically critical surfaces are multi-coated to prevent unwanted reflections and to increase the amount of light transmitted. The mechanically excellent finish of the housing provides a 1.25“ insertion diameter with filter thread and a compression ring for securely retaining eyepieces.



Viewing posture
Connection (to the telescope)
Coating of optical system
Free transmission (mm)

Special features

Correction of vertically reversed image
Correction of horizontally reversed image
Ring clamp
Filter thread


Deviating optics
Type of build
Amici prism
Length (mm)
Width (mm)
Height (mm)
Omegon 1,25'' Amici Prism 90°
Omegon 1,25'' Amici Prism 90°

Customer reviews

Great quality

Review by M. L. on 05.05.2016 19:36:21

( 5 / 5 )

I bought this to replace the stock 45° prism that came with my 90mm Maksutov. All I can say is that it is of excellent quality and I always prefer the correct image over a mirror reversed one. I compared the views through the prism and straight through the telescope, and (apart from the neck-craning and upside down image) I can't tell a difference. Perhaps the situation would be more challenging if used with a faster scope, don't know.
I thought that the price was a bit high, but I'm happy with it. If you want an erecting diagonal then just buy this one and you don't need to worry that the prism is a weak link in your optics.

PS. they don't say in the specs but the free aperture is ~24mm as I measured it - very little, if any, vignetting with most except the very widest (absolute) field eyepieces.

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