Best Telescope Diagonals

1. SVBONY SV221 90 Degree Diagonal Mirror, Telescope Diagonal 1.25 inches with Brass Compression Rings, Telescope Accessory for Refractor Telescope

The SVBONY SV221 90 Degree Diagonal Mirror is a must-have telescope accessory. It’s designed for refractor telescopes with a 1.25-inch diameter, making it easy to use with most setups. Its enhanced aluminum mold ensures clearer vision and higher light transmittance.

This diagonal mirror has a brass pressure ring to protect your eyepiece from scratches. It also supports 1.25-inch filters for versatile observations. The 90-degree design lets you observe comfortably without bending over.

With internal extinction treatment, the image is brighter and clearer. The M28.5×0.6mm filter thread adds extra functionality. It’s a reliable tool for better stargazing experiences.

2. SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (2 inch)

The SVBONY SV188P Star Diagonal is a 90-degree mirror for 2-inch telescopes. It uses a dielectric coating for 99% reflectivity, giving you bright, clear views. This durable design works with 2-inch eyepieces and filters.

It includes a 2-inch to 1.25-inch converter, so you can use smaller eyepieces too. The brass compression rings protect your eyepiece from damage, ensuring a secure fit.

The matte interior and velvet cover reduce stray light, giving you sharp images. Made of aluminum alloy, it’s lightweight and built to last.

3. SVBONY SV188P Dielectric Mirror Star Diagonal, 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings (1.25 inch)

The SVBONY SV188P Star Diagonal is a 90-degree mirror diagonal for 1.25-inch telescopes. It has dielectric coatings that reflect over 99% of light, making it great for astronomical viewing. This enhances clarity and reduces light loss.

It corrects upside-down images, so what you see is upright. However, left and right are reversed when using the 90-degree angle. This is normal and easy to adjust to.

The brass compression ring holds eyepieces firmly without scratching. It also prevents rotation during adjustments, making it effortless to use.

4. Astromania 1.25 Inch Telescope Diagonal with Amici Erecting Prism – 90° Fully-Coated Star Diagonal for Upright & Clear Astronomical Viewing, Metal/Plastic Construction, Enhanced Optical Transparency

The Astromania 1.25 Inch Telescope Diagonal makes stargazing comfortable and clear. Its 90° angle design lets you view the sky without straining. The Amici Prism ensures upright images, perfect for planets or birds.

This diagonal is fully coated for bright, sharp views. It works in extreme temperatures and fits all 1.25-inch focusers. The aluminum and ABS build is durable and lightweight.

Add filters easily with the M28.5 thread. Glare-reducing threads and dust caps keep images crisp. Its fingerprint-resistant finish stays clean and portable for any adventure.

5. SVBONY SV188 Dielectric Mirror Star Diagonal 1.25 inch 90 Degree Fully Metal for Refracting Telescope Eyepiece Lens, Telescope Accessories for Astronomical Visual

The SVBONY SV188 Star Diagonal is a must-have telescope accessory. It enhances your stargazing experience with its 90% reflectivity flat mirror, making the field of view clearer and sharper.

It fits standard 1.25-inch telescope accessories, offers a 90-degree viewing angle, and is fully made of metal. It’s compatible with refractors and catadioptric telescopes, and includes a dust cover to keep your lens clean.

6. Astromania 1.25″ 90-Degree Diagonal Mirror – More Comfortable Viewing Orientation as You Observe from Above, Filter Thread for Any 1.25″ Filter and Accepts Standard 1.25″ eyepieces

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7. Celestron 94112-A Erect Image Diagonal Prism for Refractor and Schmidt Cassegrain Telescopes, Black

The Celestron 94112-A Erect Image Diagonal Prism is a great accessory for daytime viewing with your telescope. It works well with refractors and Schmidt-Cassegrain telescopes.

This 1.25” diagonal produces right side up and left-to-right correct images. It inserts into 1.25” focusers, accepts standard 1.25” eyepieces, and weighs only 136.08 grams.

8. SVBONY SV221 Diagonal Mirror 1.25 inches, 45-Degree Correct-Image Prism Diagonal Provides Sharp Views that are Right-Side-Up and Correct Left-to-Right for Refractor Telescope

The SVBONY SV221 Diagonal Mirror is a 1.25-inch accessory for refractor telescopes. It gives sharp, right-side-up views with its 45-degree prism. This correct-image diagonal is easy to use and widely compatible.

Its innovative design uses ABS plastic and aluminum alloy for durability. The brass lock screw and compression rings ensure a secure fit and protect your telescope from scratches.

It supports 1.25-inch filters and has multi-coated surfaces for clear viewing. The dustproof cover keeps the lens clean, and the screw clamping system makes it simple to attach.

9. Astromania 1.25″ 45-Degree Diagonal Prism Optical Prism Inside Rather Than a Mirror which Makes Your Image Clear and Sharp

The Astromania 1.25″ 45-Degree Diagonal Prism uses a high-quality optical prism instead of a mirror. This gives you clear and sharp images every time. It’s perfect for both daytime and nighttime use.

The comfortable viewing angle lets you observe from above. It fits standard 1.25-inch eyepieces and filters, making it easy to use.

10. Alstar Diagonal Mirror 90 Degree, Telescope Diagonal 1.25 inches with Fixing Eyepiece Thumbscrew, Telescope Accessories for Refracting Telescope Eyepiece Lense for Astronomical Visual Observation

The Alstar Diagonal Mirror is a must-have for telescope users. It offers a 90-degree viewing angle for comfortable stargazing. Its multi-coated lenses ensure clear, sharp images.

It fits 1.25-inch telescopes with easy mounting options. The aluminum housing is durable and lightweight. Perfect for beginners and experts alike.

Enjoy longer observation sessions without neck strain. The erect images make viewing stars more enjoyable. Upgrade your telescope with this reliable accessory.