Manufacturer: Omegon
Product number: OM57293

EUR 189,00


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Omegon Star Diagonal Prism Pro Half-Penta Prism 45° 1.25"
Natural orientation of the telescope with 45° viewing angle and ultra-bright images

The Omegon half-penta prism is a three-sided prism for refractors and catadioptric telescopes. It shows you an inverted image, as if you were looking through a telescope without a prism. However, with this prism you can observe comfortably and without any physical contortions - with 45° viewing angle. This is a great help with orienting yourself in the night sky - especially when working with the Moon and star charts!

The advantages in a nutshell:
natural orientation in 45° - observe through your telescope as if you were looking straight through a refractor telescope
observer-friendly - easy to orient yourself with Moon and star maps
29 mm clear aperture - use of long eyepiece focal lengths and wide fields of view without any vignetting
120 mm optical path
better image than with an Amici prism
1.25" compression ring lock and filter thread


Provides orientation with the Moon and star maps
You can easily lose your orientation when trying to find your way in the night sky. This is particularly difficult when using lunar maps, but also with some star maps. One has to mentally compensate for the upright but reversed image created by a star diagonal in order to recognize a particular lunar crater - not always very easy! Using a half-penta prism means you do not do this anymore. Simply turn the star map 180 degrees and you have the right orientation.

High contrast with ultra bright images
BK7 glass, dielectric mirrors and multi-coated optical surfaces - these three technical features are the reason for brilliant and clear images with particularly high brightness. And the image is even than with a good Amici prism. This is due to the half-penta prism´s unique design - edges that would degrade the image in other prisms are not a problem here. The half-penta prism is a single optical work of art.

No vignetting - a free view with no darkening of the edge of the field of view
You can use long focal length eyepieces or wide fields of view. A big advantage - the 29 mm optical aperture means nothing limits a clear view of the night sky.

Anodized housing with low-reflection blackening
Inside, the prism back is blackened and the housing is light-tight - meaning high contrast is maintained and observing is always a pleasure.

Half-penta prism - a professional aid for astronomical observing
When it comes to the correct astronomical orientation of a map, the half-penta prism is a real boon to observers. This is due to the fact that the image orientation is the same as it would be for a refractor. A haalf-penta prism is a three-sided prism with two highly reflective reflecting surfaces. Incoming light always makes a 45° angle - regardless of whether the angle is oblique or direct.
Type:Deviating optics
Type of build:Diagonal prism
Viewing posture:45°
Connections:1.25"
Coating of optical system:fully
Backfocus (mm):approx. 71 mm
Correction of vertically reversed image:yes
Correction of horizontally reversed image:yes
Filter thread:yes
Ring clamp:yes
Colour:black
Weight (g):260
Star digonal prism with 45° angle



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