The Best Telescope Diagonals

Looking for the best Telescope Diagonals?

Discover now our comparison of the best Telescope Diagonals. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Telescope Diagonals are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Telescope Diagonals in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.

No. 1

SVBONY SV188P Dielectric Mirror Star Diagonal, 1.25 Inch 90 Degree Mirror Diagonal, 99% Reflectivity Dielectric Coatings with Brass Compression Rings

Dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing
1.25 inches nosepiece fits 1.25 inches telescopes; accepts standard 1.25in filters; eyepieces; Barlow lenses and other accessories with a 1.25in insert barrel
90 degree viewing angle; diagonal reflects the telescope’s light path 90 degree to provide a more comfortable viewing angle; best for observing objects overhead
Correct upside down and left right reversed image; the view image is upright; but left and right reversed if use the 90 degrees to your telescope
Brass compression ring; Built in brass ring and thumbscrew accessories avoid eyepiece to rotate during adjustments; effortless fixes more firmly and will not scratch your eyepieces barrels

No. 2

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

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

Enhanced Aluminum Die; the SV221 diagonal mirror is designed with enhanced aluminum mold; which has higher light transmittance and clearer vision
1.25 inches diameter; the SV221 diagonal mirror has a diameter of 1.25 inches; which can be applied to a 1.25 inches telescope and a 1.25 inches eyepiece
With a brass pressure ring; the SV221 diagonal mirror has a brass pressure ring; which can prevent surface damage and scratch marks when the eyepiece is used with the SV221
Supports 1.25-inch filters features internal extinction treatment and supports the connection of 1.25-inch filters; Offering versatility for various observations
With filter thread; the SV221 diagonal mirror has M28.5x0.6mm filter thread; which supports the connection of 1.25 inches filter
90 degrees design; the SV221 diagonal mirror 90 degrees deflection angle design; you don't have to bend over when performing visual observation; and the observation experience is more comfortable
Internal extinction design; the SV221 diagonal mirror has internal extinction treatment; and the acquired image is clearer and brighter

No. 3

SVBONY 2 inches 90 Deg Dielectric Mirror Diagonal for Astronomical Telescope with 1.25 inches Adapter

Excellent Quality Dielectric Diagonal; Mirror Star Diagonal - 99% Reflectivity；Provides a Comfortable 90 Degree View from your Refractor; Fits Standard 2" (50.8 mm) Diameter Focus Tubes; Use Both 2" (50.8 mm) and 1.25" (31.75 mm) Eyepieces
New 2" 90 deg 99% Dielectric Mirror Diagonal for Telescope With 1.25" adapter; full metal;has a 1/10th wave flat optical glass surface;solid aluminum housing;threaded to accept standard 2" filters;The 2" eyepiece holder uses a non-marring brass compression ring to secure your valuable eyepieces. The 1.25" adapter also has a non-marring brass compression ring
Both sizes of eyepieces may be used and are protected from dings and scratches that would result from a standard set-screw. This 2" diagonal works with any Refractor that accepts a 2" star diagonals. It can also be used with Schmidt-Cassegrain or Maksutov-Cassegrain with an optional 2 inch visual back (See below)
Dielectric diagonal is especially important;A standard aluminized diagonal has about 92% reflectance;And this decreases with time as the aluminum mirror surface ages
For the vast majority of the visible spectrum;the reflectance does not vary more than about 0.1% below 100%;And the dielectric surface does not age like aluminum;This combination leads to the equivalent of a little more light grasp compared to standard diagonals

No. 4

Orion 8879 1.25-Inch Enhanced Mirror Star Telescope Diagonal

The precision flat mirror in this 90 degrees diagonal is meticulously polished to yield excellent performance
Anodized aluminum housings are internally blackened for high contrast views free of glare
Fits 1.25" telescope focusers, accepts 1.25" eyepieces
Enhanced Aluminum mirror coatings yield 97% reflectivity for bright clear views
Includes dustcaps for storage

No. 5

$SVBONY 1.25 inches 90 Degree Dielectric Mirror Diagonal Fully Metal for Refracting Telescope Eyepiece Lens for Astronomical Visual Astrophotography$

SVBONY 1.25 inches 90 Degree Dielectric Mirror Diagonal Fully Metal for Refracting Telescope Eyepiece Lens for Astronomical Visual Astrophotography

The 90% reflectivity flat mirror can reduce light loss and make the field of view clearer and sharper
Standard 1.25 inches diameter can be used with 1.25 inches telescope accessories such as eyepieces and barlow lens
90 degree viewing angle; provide a more comfortable observation angle to observe the stars above the head
Compatible with refractors and catadioptric telescopes; not suitable for reflector telescopes
Body material is full metal; With dust cover always keep your lens clear prolong life

No. 6

$SVBONY 1.25 inches 90 Degree Zenith Diagonal Mirror for Refractor and Cassegrain Telescopes Astronomical Telescope$

SVBONY 1.25 inches 90 Degree Zenith Diagonal Mirror for Refractor and Cassegrain Telescopes Astronomical Telescope

Standard 1.25'' diameter;fit for 1.25'' focuser and eyepiece;work with refractor and catadioptric telescopes;not recommended for reflector telescope
Fully coated lens come with dust cover;keep your lens clean for superior image fidelity
Wide 90 degree angle;you can view correct image from refractor telescope stand and just look down with a comfortable angle
1.25" 90 degree diagonal mirror using with refrator telescope and makes the image upright;though left and right reversed;not affect astronomical observation
Made of aluminum alloy and durable

SaleNo. 7

Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock

Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and cass grain-type telescopes
58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece
Twist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment
Includes a Stepdown adapter, so the diagonal accepts eyepieces, Barlow lenses, threaded filters, and other accessories in both 2” and 1. 25” sizes

SaleNo. 8

$NEEWER 1.25' 90° Zenith Diagonal Mirror, Erecting Image Positive Optic Mirror Adapter for Refractor and Catadioptric Astronomical Telescope Eyepiece$

NEEWER 1.25" 90° Zenith Diagonal Mirror, Erecting Image Positive Optic Mirror Adapter for Refractor and Catadioptric Astronomical Telescope Eyepiece

【Fit for 1.25" Eyepieces】 Compatible with all 1.25" eyepieces and telescope focusers
【Work with Refractor Telescopes】 This diagonal telescope mirror is only suitable for refractor and catadioptric telescopes, not recommended for reflector telescopes
【Achieve Optimal Positions】 When the diagonal mirror is installed on the vertical axis, you will see an upright image with a mirroring effect (left to right reversal). When installed on the horizontal axis, the image will appear in an upside down orientation. No matter how you install the diagonal mirror, you will get an optimal position for observing landscapes, wildlife, and astronomy
【Secure & Safe Installation】 Directly insert the silver end into a 1.25" telescope and fasten the telescope eyepiece with the screw knob. The copper ring offers great securing strength and keeps the eyepiece in pristine condition free from scratches
【Impeccable Image Quality】 The diagonal mirror is made of quality optical glass with coatings for crisp and sharp images as well as high color fidelity. The durable construction is suitable for outdoor use

No. 9

Astromania 1.25" 90-Degree Erecting Prism Optical Prism Inside Rather Than a Mirror which Makes Your Image Clear and Sharp

Typically, you see the picture standing upside down. But what if you also want to observe nature? With this 90-degree erecting prism transform your telescope into a telescope for nature observation with upright and left-right corrected image. This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.
Comfortable observation with 90-degree: Look pleasantly from above into your eyepiece, filter thread for any 1.25" filter and accepts standard 1.25" eyepieces.
The prism gives you a bright and clear picture: The prism is made of genuine optically processed BK7 glass, high quality optical prism inside rather than a mirror which makes your image clear and sharp. The Amici prism looks as beautiful as binoculars, but you can zoom in much higher with your eyepieces.
Simply insert the erecting prism into the 1.25 "focuser and enjoy upright and right-angled images with your eyepieces - watch birds, deer at the edge of the forest, the summit cross on a mountain or a cruise ship far out on the sea.
The prism housing is made of precision molded ABS plastic and the barrels are made of metal - which ensures a tight fit and long grip. Use a clamping screw made of aluminum to fix your eyepiece. So you can even look sideways through your telescope - the eyepiece will safely stay put and not fall out. From now on nature lies at your feet: even if it is far away.

No. 10

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

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

Clear views; 45-degree correct-image prism diagonal provides sharp views
Innovative design; the main mirror housing is made of precision molded ABS plastic; and the two end barrels are precision machined from aluminum
Brass lock screw and compression rings; equipped with brass lock screw and compression rings for precise connection and protection against scratches and damages
Supports 1.25-inch filters; featuring multi-coated (MC) surfaces; and supports the connection of 1.25-inch filters for versatile observations
Erect Image observation; provides erect image observation without image inversion
Full field coating; features multi-coating for comfortable viewing experience
Clear Aperture; offers a clear aperture of 19mm; ensuring clear observation results
Dustproof design; comes with a dustproof cover to keep the lens clean
Screw clamping system; features a screw clamping system for secure and easy usage
Wide compatibility; designed for refractor telescopes and some catadioptric telescopes like schmidt-cassegrain and maksutov-cassegrain; not compatible with newtonian/dob reflector telescopes

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Last update on 2024-04-28 / Affiliate links / Images from Amazon Product Advertising API

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