The 5 Best 90 degree star diagonals (2023 reviews)

It is important to have the well suited 90 degree star diagonal. In the following post, we will help you to select the best 90 degree star diagonals.

Our review process: Show/Hide

Our Top Picks:

SVBONY 90 degree star Diagonal Buy: READ REVIEW

Serounder 90 degree star Diagonal Buy: READ REVIEW

a Alstar 90 degree star Diagonal Buy: READ REVIEW

Astromania 90 degree star Diagonal Buy: READ REVIEW

GRUS 90 degree star Diagonal Buy: READ REVIEW

SVBONY 90 degree star Diagonal

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Not everyone likes to purchase diagonal for their daily usage, but the svbony 90 degree star diagonal would be an anomoly. There are similar SVBONY diagonals with silver side plates that are described as Dielectric. It fits 1.25 inches telescopes and also fits telescopes with 1.25in focusers. It features more precision and prevents barrels or the surface of eyepieces from marring and scratching. It comes with dielectric coatings to reduce reflected light loss.

This diagonal is marked " 99 % dielectric coated " which refers to the mirror reflectivity. It is good for space viewing, for there is no upside down or right side up in space. It is easy to use and helps to get aligned with 1.25in filter directly, which is for astrophotography.

• For more comfortable overhead viewing through refractor and cassegrain type telescopes
• Provide an over 99% reflective surface
• Nicely machined all metal construction except for the mirror
• Effortless fixes more firmly and will not scratch your eyepieces barrels

Serounder 90 degree 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.

• One of the new comers and featured product
• Lot of satisfied buyers

a Alstar 90 degree 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

Astromania 90 degree star Diagonal

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If you want nothing but the best reliable diagonal, then astromania 90 degree star diagonal is the one you should definitely consider, as it manages to bring a lot to the table. This wide 90 degree angle makes you view the correct image from telescope stands. The diagonal mirror is designed for use with telescopes that have a 1.25 inch diameter optical path. It is threaded for filters. The high quality of the mirror makes the image seen clearer and brighter. It throws focus off when switching lenses. The two mirror tubes are made of metal to make the structure stronger and more durable. It has a very solid feel. It fits for a 1.25" eyepiece and telescope.

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

GRUS 90 degree star Diagonal

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate diagonal. The grus 90 degree star diagonal is exactly that - it's a simple diagonal that hits all the right notes.

• One of the new comers and featured product
• New and hot release