The 5 Best star diagonals (2023 reviews)

It is important to have the well suited star diagonal. In the following post, we will help you to select the best star diagonals.

Our review process: Show/Hide

Our Top Picks:

Serounder star Diagonal Buy: READ REVIEW

Orion star Diagonal Buy: READ REVIEW

a Alstar star Diagonal Buy: READ REVIEW

Oumij star Diagonal Buy: READ REVIEW

Astromania star Diagonal Buy: READ REVIEW

Serounder star Diagonal

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It is a very good diagonal with a clear image. It is constructed with aluminum alloy housing and stainless steel cover plate, available for long lifespan. The image is inverted (upside down) as these diagonals usually do and it is clear, in focus. It is used for 1.25 inch focus seat and 1.25inch eyepiece.

• Delivers what they promise
• Good brand reputation

Orion star Diagonal

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The 25 inch twist-tight dielectric mirror star diagonal gives the typical thumbscrew-equipped telescope diagonal a new twist. It features machine-threaded internal baffles to ensure optimal contrast and also eliminate pesky internal reflections and glare. This diagonal will improve the view in your refractor telescope. It will flip the image depending on the scope set-up.

The twist tight is easy to use and works great removing your eyepieces with gloved hands or bare hands. Protective caps are included to keep the diagonal free of dust when not in use. It comes with such high reflectivity, this diagonal will help you obtain the brightest views possible through a refractor or cassegrain telescope. This is a must have, and it makes exchanging eyepieces 100% easier.

• Well made and works even better
• Tight clamping mechanism that securely grasps inserted
• All metal construction with anodized red aluminum twist tight collar

a Alstar star Diagonal

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This Alstar star diagonal has a 1.25" metal barrel. The clamping screws lock the barrel firmly in place without scoring the nosepiece, as is the case with many cheaper products. It is made with machined metal and a quality mirror. The chrome finish not only looks good, but is also practical, as the star diagonal always remains firmly attached to the focuser. This barrel will keep your star diagonal in condition for virtually forever.

• Useful for refractor and cassegrain telescopes
• Protective coating on the mirror to ensure a long life, metal barrel
• New and hot release

Oumij star Diagonal

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The oumij star diagonal's material feels more premium than its price would suggest. This diagonal can correct upside down and left-right reversed image easily, which allows you to view things during daytime in the correct position. It comes with dust cover to keep your lens clear, easy to install and use. The Wide 45 degree angle makes you view correct image from refractor telescope stand and just look down with a comfortable angle. It fits for a 1.25inch telescope eyepiece and focuser.

• Work with refractor and catadioptric telescopes
• Plastic body with optical glass lens, providing clear and sharp image
• Good investment for long term

Astromania star Diagonal

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We would, of course, be remiss if we didn't mention astromania star diagonal for daily purpose. This barrel will keep your star diagonal in condition for virtually forever. It provides a comfortable 90 degree view from your refractor. The mirror has everything that is possible optimised, it is the link between your eye and the telescope. It is threaded for filters. The two mirror tubes are made of metal to make the structure stronger and more durable. It throws focus off when switching lenses. The diagonal is well worth it and value is terrific. It has a very solid feel. It is fits for a 1.25" eyepiece and telescope.

• Protective coating on the mirror to ensure a long life
• Useful for refractor and cassegrain telescopes
• Gets the job done with smaller budget telescopes