Best Telescope Diagonals In September 2026

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In this Best Telescope Diagonals product guide, we’ll help you make a more informed decision and select the product with the benefits you need.

To help you in your search, we have completed this list of the Best Telescope Diagonals.

Top Rated Best Telescope Diagonals Of 2026

Rank	Product Name	Score
1	Acouto 24.3mm 45 Degree Refracting Telescope Erecting Prism Eyepiece Diagonal Mirror Buy Now	9.7 Buy Now
2	1.25" 45-Degree Erect Image Prism Diagonal for Telescope, 31.7mm Optical Prism Inside Rather Buy Now	9.5 Buy Now
3	Meade Instruments 07202 #918A 1.25-Inch Diagonal Prism Buy Now	9.1 Buy Now
4	Celestron 1.25" Star Diagonal, Black (94115-A) Buy Now	8.8 Buy Now
5	Celestron 2-Inch XLT Diagonal Mirror (for SCT Telescope) Buy Now	8.6 Buy Now
6	Astromania 2" 45-Degree Erecting Prism Diagonal for Telescope Buy Now	8.3 Buy Now
7	Orion 1.25 Inch Twist-Tight Dielectric Mirror Star Diagonal Buy Now	8.1 Buy Now
8	Orion 8727 2-Inch Dielectric Mirror Star Diagonal Buy Now	7.8 Buy Now
9	Orion 8754 1.25-Inch Deluxe 45-degree Correct-Image Prism Diagonal Buy Now	7.5 Buy Now
10	Meade Instruments 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter Buy Now	7.2 Buy Now

1. Acouto 24.3mm 45 Degree Refracting Telescope Erecting Prism Eyepiece Diagonal Mirror

• Guaranteeour product are support 30 days refund and one year warranty. any problem or questions, please do not hesitate to contact us
• Premium quality0.96inch/24.3mm astronomy telescope erecting prism diagonal mirror 45 degree. exquisite curved surface, chic anti-vibration prism cavity, anti-shedding slope design.
• High reflectivitybuilt-in high-definition reflective prism, to create a more comfortable viewing position and clear image
• Anti-slip rubber designthis special protoction design can prevent eyepiece from scratches
• Fully coatedhigh quality optical glass for maximum brightness

2. 1.25" 45-Degree Erect Image Prism Diagonal for Telescope, 31.7mm Optical Prism Inside Rather

• High quality 31.7mm optical prism inside rather than a mirror which makes your image clear and sharp.
• Protective coating on the prism to ensure a long life, metal barrel - for secure seating in the focuser.
• Work with refractor and catadioptric telescopes, not recommended for reflector telescope.
• This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.
• More comfortable viewing orientation as you observe from above. accepts standard 1.25" eyepieces.

3. Meade Instruments 07202 #918A 1.25-Inch Diagonal Prism

• Directions light 90 from telescope
• Image will appear upright, yet mirror is reversed
• Provides a more comfortable viewing position
• Fully coated, high quality glass for maximum brightness

4. Celestron 1.25" Star Diagonal, Black (94115-A)

• Fits telescopes with 1.25 focusers or visual backs, 90 viewing angle, best for observing objects overhead
• Accepts standard 1.25 eyepieces, barlow lenses, and other accessories with a 1.25 insert barrel

5. Celestron 2-Inch XLT Diagonal Mirror (for SCT Telescope)

• Housing is precision machined to achieve and hold good optical alignment.
• Includes a 2 to 1.25 adapter and aluminum carry case
• 1/10th wave mirror is tested with an interferometer to ensure quality
• 2 sct mirror diagonal with high performance xlt coatings

6. Astromania 2" 45-Degree Erecting Prism Diagonal for Telescope

• Entirely aluminum, black anodized, smooth finish. if there is any problem of focusing due to the light path for a few telescopes, please feel free to contact us for help.
• High accuracy and high light reflection prism.
• Image erecting bak4 prism with anti-reflection coating.
• 1.25" adapter with brass compression ring included.
• Internally matte blackened and threaded for no internal stray light reflection.

7. Orion 1.25 Inch Twist-Tight Dielectric Mirror Star Diagonal

• 1.25", 90-degree mirror diagonal features sophisticated dielectric coatings with highly efficient 99% reflectivity for peak performance
• Machined and anodized aluminum housing features machine-threaded glare baffles to eliminate glare for great performance
• Nosepiece barrel threaded to accept 1.25" orion filters
• Durable dielectric mirror coatings provide higher reflectivity for maximum brightness and contrast
• Twist-tight clamping mechanism grips inserted eyepieces more securely than typical thumbscrew-equipped diagonals - without scratching!

8. Orion 8727 2-Inch Dielectric Mirror Star Diagonal

• 90 degrees 2" mirror diagonal features sophisticated, lab-tested dielectric coatings that provide an astounding 99% reflectivity
• Dielectric mirror coatings are more durable than enhanced aluminum coatings and provide higher reflectivity for maximum view brightness
• The diagonal is a great way to make nighttime viewing orientations through a refractor telescope more comfortable
• Machined and anodized aluminum housing features machine-threaded glare baffles for high contrast
• Nosepiece barrel is threaded to accept 2" orion filters, a 2"-1.25" step-down adapter is included

9. Orion 8754 1.25-Inch Deluxe 45-degree Correct-Image Prism Diagonal

• Turn any refractor or cassegrain telescope into a high-performance daytime spotting scope with our deluxe 45 degree correct-image diagonal
• High-quality prism diagonal provides a comfortable, 45 degree viewing orientation for great daytime terrestrial views
• 3 arc second tolerance prism is 35% larger than prisms used in other models
• Sporting a 27mm clear aperture, multi-coated prism, deluxe 45 degree correct-image diagonal provides sharp views

10. Meade Instruments 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with

• Multi-layered dielectric coatings that produce 99-percent reflectivity for brighter, sharper images
• Interferometer-tested for excellent performance
• Comes with a 1-year limited
• Dielectric coatings for the most light transmission possible
• Optics are made with pyrex glass