About this item
- High quality optical Prism inside rather than a mirror which makes your image clear and sharp.
- 1.25″ 45-degree mirror star diagonal for any telescope with 1.25″ connector (not suitable for Newtonians).
- More comfortable viewing orientation as you observe from above, filter thread for any 1.25″ filter. Accepts standard 1.25″ eyepieces.
- This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.
- Protective coating on the mirror to ensure a long life, metal barrel – for secure seating in the focuser.
Product Description

Feature of Alstar 1.25″ 45-Degree Diagonal Prism Optical Prism
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High Quality Prism Optical MaterialThe prism is made of genuine optically processed glass; high quality optical prism inside rather than a mirror which makes your image clear and sharp. Compared with other glass materials, it greatly improves the transmission of transmitted light and enriches the saturation and contrast of image color. |
Comfortable Observation with 45-degreeIt provides a comfortable object observation angle. The image you see through it is correct, which means that the image you see is vertical and correct from left to right. It’s convenient to see the zenith of the sky. It’s close to horizontal observation. |
Made of Plastic and Metallic Aluminum
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1.25Inch Standard Interface Size1.25″ 45-degree mirror star diagonal for any telescope with 1.25″ connector (not suitable for Newtonians). |
Free Dust CoverTwo hard plastic dust covers are included in the package, which can effectively protect the lenses from damage and dirt when you are not using them. |
Built-in Matt ThreadThe interference of stray light is effectively reduced, which not only improves the brightness of the image, but also effectively reduces the formation of dark edge and makes the edge details of the image clearer. |
Cleaning and Storage
First, clean the surface with a dust removal balloon. This step is very important. After removing the hard dust on the surface, drop the special cleaning water for the lens (remember not to use glasses for night cleaning), and then use the special lens cleaning cloth or cotton swab to remove the surface cleaning liquid. After use, the two dust plugs (contained in the package) need to be installed back at both ends of the eyepiece to avoid direct sunlight, so as to prevent dust from entering the eyepiece and prolong the service life to the greatest extent.

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