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Best Telescope Diagonals - Buying Guide

Last Updated: 01/17/2019

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Bestselling Telescope Diagonals on Amazon

  1. Celestron 2-Inch XLT Diagonal Mirror (for SCT Telescope)
  2. Astromania 1.25" 90-Degree Erecting Prism Optical Prism Inside Rather Than a Mirror which Makes Your...
  3. Orion 8727 2-Inch Dielectric Mirror Star Diagonal
  4. SVBONY 1.25" 45 Degree Erecting Image Diagonal Prism Zenith Mirror for Refractor Catadioptric Telesc...
  5. SVBONY 1.25" 90 Degree Diagonal Adapter Erect Image Zenith Mirror Prism Fully Metal for Refracting T...
  6. Astromania 1.25" 90-Degree Diagonal Mirror - More Comfortable Viewing Orientation as You Observe fro...
  7. Solomark 2inch Explorer Enhanced Dielectric Diagonal Mirror - ENHANCED 99% REFLECTIVITY for Maximum ...
  8. Orion 2" Twist-Tight Dielectric Mirror Star Diagonal
  9. Baader Planetarium 2 inch Clicklock Mirror Diagonal 295
  10. Alstar 1.25" 45-degree Diagonal Prism optical Prism inside rather than a mirror which makes your ima...

  #1

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

Model: 93527   |    Mpn: 93527   |    Ean: 0050234935272   |    PartNumber: 93527   |   Asin: B000F8SZIG

There are few telescope accessories that work as hard or matter as much as a diagonal! An integral part of the optical chain, a good diagonal can make a big difference in the quality of the image you see. A 2 diagonal is required if you want to use 2 eyepieces when observing with your telescope. The larger 2 barrel allows you to see a bigger percentage of the telescope s light cone, which works wonders for capturing faint deep sky objects with low surface brightness. The Celestron 2 Mirror Diagonal was built for superior performance. The housing is machined with precision instruments to make sure the optics stay perfectly aligned. The diagonal s mirror is tested with an interferometer, and is guaranteed to be 1/10 wave or better. The mirror s surface is covered with the same high performance XLT coatings used on Celestron s best telescopes, and the result is a sharp, bright image that will satisfy the most discriminating amateur astronomer. This 2 diagonal threads securely to the rear cell of standard Schmidt-Cassegrain telescopes. To take advantage of the XLT Diagonal s extra light throughput, insert a 2 eyepiece into the barrel. If you want to use 1.25 eyepieces, slide the included 2 to 1.25 adapter into the eyepiece barrel and secure it with the thumbscrew. When you re not observing, store your diagonal in the included aluminum case for protection.

Features

  • 2" SCT mirror diagonal with high performance XLT coatings
  • 1/10th wave mirror is tested with an interferometer to ensure quality
  • Housing is precision machined to achieve and hold good optical alignment.
  • Includes a 2 to 1.25 adapter and aluminum carry case
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Brand: Celestron   |   Manufacturer: Celestron

Item Dimensions: 8 x 8 x 7 inches (20.3 x 20.3 x 17.8 cm)   |   Package Dimensions: 7.01 x 7.4 x 8.19 inches (17.8 x 18.8 x 20.8 cm)

Amazon Price: $114.95 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $135.95 | Used Price: $99.78

Warranty: 2 Year accessories warranty

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  #2

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

Model: SKU_AM_EP1D90   |    Mpn: SKU_AM_EP1D90   |    Ean: 6970019291093   |    PartNumber: SKU_AM_EP1D90   |   Asin: B0140U9XXK

Astromania 1.25" 90-degree Erecting Prism. This is an economical 1.25" 90-deg prism diagonal for astronomical telescopes and spotting scopes. With this 90-degree erecting prism transform your telescope into a telescope for nature observation. This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.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. Please Note: This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. Not intended for use with reflector telescopes like Newtonian / Dobsonian reflector telescopes or other variants of Newtonian telescopes.

Features

  • 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 Amici 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 two sleeves 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 does not sit and fall out. From now on nature lies at your feet: even if it is far away.
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Brand: Astromania   |   Manufacturer: Astromania

Item Dimensions: 2.11 x 2.8 x 4.42 inches (5.4 x 7.1 x 11.2 cm)   |   Package Dimensions: 2.3 x 2.6 x 4.5 inches (5.8 x 6.6 x 11.4 cm)

Amazon Price: $32.99 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $32.99

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  #3

Orion 8727 2-Inch Dielectric Mirror Star Diagonal

Model: 8727   |    Mpn: 8727   |    Ean: 0759270087272   |    PartNumber: 8727   |   Asin: B000FA73UA

The Orion 2" Dielectric Mirror Star Diagonal is an ideal choice for refractor and Cassegrain telescopes equipped with a big, 2" focuser. This diagonal is perfect for those who wish to obtain the brightest views possible while using a diagonal. The high-quality mirror diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. With such a high reflectivity diagonal, your telescopic views of starry skies will be bright, detailed and full of contrast. Dielectric mirror coatings are more durable than enhanced aluminum coatings, so you'll enjoy year after year of exceptional performance without degradation. The machined and anodized aluminum diagonal housing features machine-threaded internal baffles to ensure high-contrast performance. This 2" diagonal has a 1.25" adapter, so it can be used with both 2" and 1.25" telescope eyepieces. A non-marring compression collar is built-in to both the 2" holder and 1.25" adapter to safely secure any inserted telescope eyepiece without scratching. The diagonal's 2" nosepiece barrel is conveniently threaded to accept like-sized filters. Protective caps are included to keep the diagonal free of dust when not in use. Diagonals are not recommended for use with Newtonian reflector telescopes.

Features

  • 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
  • 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
  • The diagonal is a great way to make nighttime viewing orientations through a refractor telescope more comfortable
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Brand: Orion   |   Manufacturer: Orion

Package Dimensions: 4.6 x 5.1 x 7.8 inches (11.7 x 13.0 x 19.8 cm)

Amazon Price: $125.99 | as of 01/17/2019(7:23pm pst)
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List Price: $152.33

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  #4

SVBONY 1.25" 45 Degree Erecting Image Diagonal Prism Zenith Mirror for Refractor Catadioptric Telescope and Astronomical Telescope Eyepiece

Model: 4331908552   |    Mpn: 4331908552   |    Ean: 0714559073797   |    PartNumber: 4331908552   |   Asin: B071CKG619

SVBONY 45 degree erecting image diagonal prism for telescope and any standard 1.25" eyepiece using:
It's easily correct upside down and left right reversed image;
makes it easier to navigate the day and night skies with telescope in correct position Application:
You can insert it into the 1.25 " telescope silver terminal;
the other end with a screw fixed 1.25" eyepiece
;it can also be used to observe astronomy;nebula;cluster;nebula scattered with high brightness and excellent optical properties Main Features:
Semi-metallic material;45 degrees prism
High optical lens transparency provides clear and sharp images
Standard 1.25 "diameter fits for 1.25" eyepiece and telescope
The dust cover keeps the lens clean to extend the service life Specification:
Type: zenith mirror
Observation angle: 45 degrees
Color black and silver
Material:metal and plastic Package includes:
1 x 1.25" 45 degree zenith mirror
Lifetime warranty;we confidently promise lifetime warranty for each one from us

Features

  • High-quality prism diagonal provides a comfortable and sharp 45 degree viewing orientation for great daytime terrestrial views and night time astronomy applications for telescopes or spotting scopes
  • High optical lens transparency;the large quality prism allows more light transmission;so that delievers a clear image
  • Standard 1.25 diameter for filter thread for any 1.25 filter;fits for the standard 1.25 telescope eyepiece
  • Semi-metallic zenith mirror has dust cover keeping the lens clean,so that provides clear and sharp images and extends the service life
  • Lifetime warranty;we confidently promise lifetime warranty for each one from us
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Brand: SVBONY   |   Manufacturer: SVBONY

Item Dimensions: 2.2 x 3 x 4.3 inches (5.6 x 7.6 x 10.9 cm)   |   Package Dimensions: 2.36 x 4.65 x 6.93 inches (6.0 x 11.8 x 17.6 cm)

Amazon Price: $19.99 | as of 01/17/2019(7:23pm pst)
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List Price: $19.99

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  #5

SVBONY 1.25" 90 Degree Diagonal Adapter Erect Image Zenith Mirror Prism Fully Metal for Refracting Telescope Eyepiece Lens

 Ean: 0794604981253   |    PartNumber: FUSF9171A   |   Asin: B07GPMX7BN

The Svbony fully metal 1.25" Mirrors Diagonal zenith mirror offers an upright figure which is but turned backward in left and right position. It is suitable in particular for astronomical observations. The mirror depicts clean and full of contrasts.
The mirror is suitable for refractors, Celestron EQ, Meade Infinity and similar telescopes. It is not suitable due to the length reflectors for Newton. Specifications:
Connection eyepiece: 1.25"
Connecting telescopic: 1.25" & 2" (2" need adapter)
Clamp: 1 screw
Reflectivity: 90%
Housing material: Metal
Suitable for: Refractors
Net Weight: 142g / 5.0oz Not suitable for: Newtonians Package Includes:
Fully Metal 1.25" Mirrors Diagonal 90-Degree
1.25" Dust Cover

Features

  • Standard 1.25'' diameter; fit for 1.25'' eyepiece and telescope focuser
  • Work with refractor and catadioptric telescopes;not for reflector telescope
  • Wide 90 degree angle;you can view correct image from refractor telescope stand and just look down with a comfortable angle
  • Super easy to use;just insert into 1.25'' telescope at the silver end;the other end fix 1.25'' eyepiece by the screw
  • Body material is full metal;optical glass lens provide clear and sharp image With dust cover always keep your lens clear prolong life
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Brand: SVBONY   |   Manufacturer: SVBONY

Item Dimensions: 2.34 x 2.34 x 4.68 inches (5.9 x 5.9 x 11.9 cm)   |   Package Dimensions: 0.7 x 2.7 x 6.9 inches (1.8 x 6.9 x 17.5 cm)

Amazon Price: $31.99 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $31.99

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  #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

Model: SKU_AM_DM1D90   |    Mpn: SKU_AM_DM1D90   |    Ean: 6970019291086   |    PartNumber: SKU_AM_DM1D90   |   Asin: B0140U9W3G

Whether it's the Moon, Jupiter or a beautiful nebula - in order to enjoy observing at the telescope you should always be comfortable. In many telescopes, that is only possible by using a star diagonal - which directs the image upwards by 90.This Astromania star diagonal has a 1.25" metal barrel. The chrome finish not only looks good, but is also practical, as the star diagonal always remains firmly attached to the focuser. The clamping screws lock the barrel firmly in place without scoring the nosepiece, as is the case with many cheaper products. In short - this barrel will keep your star diagonal in condition for virtually forever.The mirror has had everything that is possible optimised, within this price range, to ensure you enjoy a bright image - even at higher magnifications. It is the link between your eye and the telescope - and is hence just as important.Sometimes you do not want to have to re-install a filter every time you use a new eyepiece. Perhaps you might want to observe the Moon today with a range of eyepieces - but with the same filter? That is also possible due to the filter thread provided in the star diagonal.

Features

  • 1.25" 90-degree mirror star diagonal for any telescope with 1.25" connector (not suitable for Newtonians).
  • More comfortable viewing orientation as you observe from above, filter thread for any 1.25 filter. Accepts standard 1.25 eyepieces.
  • Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.
  • Useful for refractor and Cassegrain telescopes - not recommended for reflectors.
  • Wide 90 degree angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle.
  • See more on Amazon...

Brand: Astromania   |   Manufacturer: Astromania

Item Dimensions: 2.11 x 2.8 x 4.42 inches (5.4 x 7.1 x 11.2 cm)   |   Package Dimensions: 2 x 3 x 4 inches (5.1 x 7.6 x 10.2 cm)

Amazon Price: $21.99 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $21.99

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  #7

Solomark 2inch Explorer Enhanced Dielectric Diagonal Mirror - ENHANCED 99% REFLECTIVITY for Maximum View Brightness and Sharpness

 Ean: 0607994613188   |    PartNumber: QHDM   |   Asin: B078WNY57N

If you are interested in making nighttime viewing orientations through a refractor telescope, the Solomark Explorer was designed with you in mind.

If you are looking for the most clear view from your powerful arms, along with durability, then the Solomark Explorer is here for you.

The Solomark Explorer 2inch mirror diagonal features sophisticated,Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness, so that you have the best view in your observing adventures. It is also has a durable and rugged armor for years of exceptional performance.

Great Optical System
Dielectric coating allows 99% reflectivity for maximum view brightness and sharpness.
High precision 10mm thick mirror substrate flat for optimal image stability.
Polished to 1/10th wave or better accuracy. Baffles is machine-threaded and anti-reflection process for high contrast.

Durable Housing
High quality machined aluminum housing.
2" to 1.25" eyepiece adapter included.

What's in the box?
Solomark 2 inch 99% Reflectivity Diagonal
Eyepiece and Lens Protection Covers

And don't forget our 1 Years WARRANTY!

Get Yours Today!

Features

  • Explore the nature of the world -This 2inch mirror diagonal features sophisticated, Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness.
  • High precision optical glass with 10mm thick mirror substrate.
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Brand: SOLOMARK   |   Manufacturer: SOLOMARK

Package Dimensions: 4 x 6 x 7 inches (10.2 x 15.2 x 17.8 cm)

Amazon Price: $69.99 | as of 01/17/2019(7:23pm pst)
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List Price: $69.99

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  #8

Orion 2" Twist-Tight Dielectric Mirror Star Diagonal

Model: 40902   |    Mpn: 40902   |    Ean: 0759270409029   |    PartNumber: 40902   |   Asin: B01LWVB3YQ

Orion has given their 2 inch dielectric mirror diagonal a new twist - literally! With its twist-tight clamping mechanism, the Orion 2 inch Dielectric Twist-Tight Mirror Star Diagonal presents a significant upgrade from typical thumbscrew-equipped diagonals. A simple clockwise twist of the diagonal's knurled red aluminum collar precisely centers any inserted eyepiece or accessory and holds it securely in place.

The innovative twist-tight mechanism keeps your valuable eyepieces free of pesky thumbscrew scratches, and also provides a more secure grip than thumbscrew-equipped diagonals. You'll especially appreciate the Orion 2 inch Dielectric Twist-Tight Mirror Star Diagonal when using a telescope during clear, cold evenings thanks to how easy it is to tighten and loosen the large, knurled collar - even while wearing bulky gloves!

Built around a highly reflective mirror featuring lab-tested dielectric coatings that provide an astounding 99% reflectivity, the Orion 2 inch Dielectric Twist-Tight Mirror Star Diagonal will help you obtain the brightest views possible through a refractor or Cassegrain telescope equipped with a big, 2 inch focuser. Plus, since dielectric coatings are more durable than enhanced aluminum coatings, you'll enjoy year after year of exceptional performance without degradation. To further optimize contrast and brightness, the diagonal's anodized aluminum housing features machine-threaded internal baffles to eliminate pesky internal reflections and glare.

The versatile Orion 2 inch Dielectric Twist-Tight Mirror Star Diagonal includes a handy 1.25 inch adapter, so it can be used with both 2 inch and 1.25 inch telescope eyepieces. Both the 2 inch holder and 1.25 inch step-down adapter feature a twist-tight collar. Protective caps are included to keep the diagonal free of dust when not in use.

Please note: diagonals are not recommended for use with Newtonian reflector telescopes

Features

  • This 2", 90-degree mirror diagonal features sophisticated dielectric coatings with highly efficient 99% reflectivity
  • Twist-tight clamping mechanism grips inserted eyepieces more securely than typical thumbscrew-equipped diagonals - without scratches!
  • Dielectric mirror coatings provide higher reflectivity for maximum brightness and contrast with more durability than enhanced aluminum coatings
  • Machined and anodized aluminum housing features machine-threaded glare baffles for peak performance
  • Nosepiece barrel is threaded to accept 2 Orion filters, and a step-down 2-1.25 adapter is included
  • See more on Amazon...

Brand: ORION   |   Manufacturer: Orion

Item Dimensions: 4 x 3.25 x 6 inches (10.2 x 8.3 x 15.2 cm)   |   Package Dimensions: 4.69 x 5.08 x 7.76 inches (11.9 x 12.9 x 19.7 cm)

Amazon Price: $179.99 | as of 01/17/2019(7:23pm pst)
Availibility:
List Price: $189.99

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  #9

Alstar 1.25" 45-degree Diagonal Prism optical Prism inside rather than a mirror which makes your image clear and sharp

Model: SKU_AM_DP1D45AR   |    Mpn: SKU_AM_DP1D45AR   |    Ean: 6970019299761   |    PartNumber: SKU_AM_DP1D45AR   |   Asin: B074DQP34N

Whether it's the Moon, Jupiter or a beautiful nebula - in order to enjoy observing at the telescope you should always be comfortable. In many telescopes, that is only possible by using a star diagonal - which directs the image upwards by 45.This Alstar star diagonal has a 1.25" metal barrel. The chrome finish not only looks good, but is also practical, as the star diagonal always remains firmly attached to the focuser. The clamping screws lock the barrel firmly in place without scoring the nosepiece, as is the case with many cheaper products. In short - this barrel will keep your star diagonal in condition for virtually forever.The mirror has had everything that is possible optimised, within this price range, to ensure you enjoy a bright image - even at higher magnifications. It is the link between your eye and the telescope - and is hence just as important.Sometimes you do not want to have to re-install a filter every time you use a new eyepiece. Perhaps you might want to observe the Moon today with a range of eyepieces - but with the same filter? That is also possible due to the filter thread provided in the star diagonal.

Features

  • High quality optical Prism inside rather than a mirror which makes your image clear and sharp.
  • 1.25 45-degree mirror star diagonal for any telescope with 1.25 connector (not suitable for Newtonians).
  • More comfortable viewing orientation as you observe from above, filter thread for any 1.25 filter. Accepts standard 1.25 eyepieces.
  • This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.
  • Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.
  • See more on Amazon...

Brand: Alstar   |   Manufacturer: Alstar

Item Dimensions: 2.8 x 2.1 x 4.4 inches (7.1 x 5.3 x 11.2 cm)   |   Package Dimensions: 2.1 x 2.8 x 4.4 inches (5.3 x 7.1 x 11.2 cm)

Amazon Price: $27.99 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $27.99

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  #10

Alstar 1.25" 90-degree Diagonal Mirror

Model: SKU_AM_DM1D90AR   |    Mpn: SKU_AM_DM1D90AR   |    Ean: 6970019299785   |    PartNumber: SKU_AM_DM1D90AR   |   Asin: B074DR3LGC

Whether it's the Moon, Jupiter or a beautiful nebula - in order to enjoy observing at the telescope you should always be comfortable. In many telescopes, that is only possible by using a star diagonal - which directs the image upwards by 90.This Alstar star diagonal has a 1.25" metal barrel. The chrome finish not only looks good, but is also practical, as the star diagonal always remains firmly attached to the focuser. The clamping screws lock the barrel firmly in place without scoring the nosepiece, as is the case with many cheaper products. In short - this barrel will keep your star diagonal in condition for virtually forever.The mirror has had everything that is possible optimised, within this price range, to ensure you enjoy a bright image - even at higher magnifications. It is the link between your eye and the telescope - and is hence just as important.Sometimes you do not want to have to re-install a filter every time you use a new eyepiece. Perhaps you might want to observe the Moon today with a range of eyepieces - but with the same filter? That is also possible due to the filter thread provided in the star diagonal.

Features

  • Wide 90 degree angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle.
  • Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.
  • More comfortable viewing orientation as you observe from above, filter thread for any 1.25 filter. Accepts standard 1.25 eyepieces.
  • Useful for refractor and Cassegrain telescopes - not recommended for reflectors.
  • 1.25 90-degree mirror star diagonal for any telescope with 1.25 connector (not suitable for Newtonians).
  • See more on Amazon...

Brand: Alstar   |   Manufacturer: Alstar

Item Dimensions: 2.8 x 2.1 x 4.4 inches (7.1 x 5.3 x 11.2 cm)   |   Package Dimensions: 2 x 3 x 4.75 inches (5.1 x 7.6 x 12.1 cm)

Amazon Price: $21.99 | as of 01/17/2019(7:23pm pst)
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List Price: $21.99

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  #11

Orion 8879 1.25-Inch Enhanced Mirror Star Telescope Diagonal

Model: 8879   |    Mpn: 8879   |    Ean: 0759270088798   |    PartNumber: 8879   |   Asin: B000BMPBLK

Don't put a standard-issue diagonal into a high-quality refractor or Cassegrain telescope or you'll be losing 10% or more of the light collected by the scope's optics. Use an Orion Enhanced diagonal instead. Their lab-tested enhanced aluminum coatings reflect 97% of the inbound light to your eyepiece, for brighter images compared to standard diagonals. Beautifully machined and anodized aluminum housings feature machine-threaded baffles for high contrast and nonmarring compression ring collars for securing the eyepiece. Nosepiece barrels are threaded to accept filters. Endcaps included.

Features

  • 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
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Brand: Orion   |   Manufacturer: Orion

Package Dimensions: 3.6 x 4.3 x 5.2 inches (9.1 x 10.9 x 13.2 cm)

Amazon Price: $71.99 | as of 01/17/2019(7:23pm pst)
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List Price: $76.68

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  #12

Orion 1.25 Inch Twist-Tight Dielectric Mirror Star Diagonal

Model: 40901   |    Mpn: 40901   |    Ean: 0759270409012   |    PartNumber: 40901   |   Asin: B01LWJM739

The Orion 1.25 inch Twist-Tight Dielectric Mirror Star Diagonal gives the typical thumbscrew-equipped telescope diagonal a new twist - literally! This innovative diagonal features a twist-tight clamping mechanism that securely grasps inserted 1.25 inch eyepieces and accessories with a simple clockwise twist of its red aluminum collar.

Unlike thumbscrew-equipped diagonals, the Orion Twist-Tight diagonal delivers equal inward pressure to precisely center eyepieces, camera nosepieces, and other equipment along the light path of the telescope with a more robust grip. What's more, since this diagonal doesn't use a thumbscrew, you don't have to worry about annoying scratches or gouges appearing on your treasured eyepieces, and there's no thumbscrew to lose in the dark! The easy-grip, knurled aluminum twist-tight collar is delightfully easy to adjust, even while wearing gloves during cold nights.

The Orion 1.25 inch Dielectric Twist-Tight Mirror Star Diagonal is built around a highly reflective mirror with sophisticated, lab-tested dielectric coatings providing 99% reflectivity. With such high reflectivity, this diagonal will help you obtain the brightest views possible through a refractor or Cassegrain telescope. The 1.25 inch Twist-Tight Diagonal's rugged anodized aluminum housing features machine-threaded internal baffles to ensure optimal contrast and also eliminate pesky internal reflections and glare. What's more, since dielectric coatings are more durable than enhanced aluminum coatings, you'll enjoy year after year of exceptional performance without degradation.

The diagonal's 1.25 inch nosepiece barrel is conveniently threaded to accept like-sized filters so you can easily swap between different telescope eyepieces and other accessories without the hassle of re-attaching the filter each time. Protective caps are included to keep the diagonal free of dust when not in use.

Please note: diagonals are not recommended for use with Newtonian reflector telescopes.

Features

  • 1.25", 90-degree mirror diagonal features sophisticated dielectric coatings with highly efficient 99% reflectivity for peak performance
  • Twist-tight clamping mechanism grips inserted eyepieces more securely than typical thumbscrew-equipped diagonals - without scratching!
  • Durable dielectric mirror coatings provide higher reflectivity for maximum brightness and contrast
  • 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
  • See more on Amazon...

Brand: ORION   |   Manufacturer: Orion

Item Dimensions: 3 x 1.75 x 4.5 inches (7.6 x 4.4 x 11.4 cm)   |   Package Dimensions: 3.62 x 4.25 x 5.12 inches (9.2 x 10.8 x 13.0 cm)

Amazon Price: $116.99 | as of 01/17/2019(7:23pm pst)
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List Price: $119.99

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  #13

Solomark 2inch Explorer Enhanced Dielectric Diagonal Mirror with 2inch-1.25inch Adapter - ENHANCED 99% REFLECTIVITY for Maximum View Brightness and Sharpness-Carbon Fiber Side Plates

Model: 4331908551   |    Mpn: QHDM   |    Ean: 0747380997611   |    PartNumber: QHDM   |   Asin: B01GCILRKK

If you are interested in making nighttime viewing orientations through a refractor telescope, the Solomark Explorer was designed with you in mind.

If you are looking for the most clear view from your powerful arms, along with durability, then the Solomark Explorer is here for you.

The Solomark Explorer 2inch mirror diagonal features sophisticated,Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness, so that you have the best view in your observing adventures. It is also has a durable and rugged armor for years of exceptional performance.

Great Optical System
Dielectric coating allows 99% reflectivity for maximum view brightness and sharpness.
High precision 10mm thick mirror substrate flat for optimal image stability.
Polished to 1/10th wave or better accuracy. Baffles is machine-threaded and anti-reflection process for high contrast.

Durable Housing
100% carbon fiber side plates increase in strength and reduce the weight.
High quality machined aluminum housing.
Nosepiece barrel and 2"-1.25" adapter is threaded to accept 2" filters.
2" to 1.25" eyepiece adapter included.
2 brass lock screws and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching.

What's in the box?
Solomark 2inch 99% Reflectivity Diagonal
2"-1.25" Adapter
Eyepiece and Lens Protection Covers
Non-Abrasive Lens Cleaning Cloth

And don't forget our 3 Years WARRANTY!

Get Yours Today!

Features

  • Explore the nature of the world -This 2inch mirror diagonal features sophisticated, Multi-layered dielectric coatings that provide an astounding 99% reflectivity for maximum view brightness and sharpness.
  • High precision optical glass with 10mm thick mirror substrate.
  • 100% carbon fiber side plates and Baffles is machine-threaded and anti-reflection process for high contrass
  • Nosepiece barrel is threaded to accept 2 filters. 2 pieces of brass lock screws for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching.
  • Comes with a 2-1.25 step-down adapter which allows to use 1.25 eyepieces and other 1.25 accessories. Endcaps included.
  • See more on Amazon...

Brand: SOLOMARK   |   Manufacturer: SOLOMARK

Package Dimensions: 4.5 x 6 x 7 inches (11.4 x 15.2 x 17.8 cm)

Amazon Price: $96.99 | as of 01/17/2019(7:23pm pst)
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List Price: $96.99

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  #14

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

Model: SKU_AM_DP1D452   |    Mpn: SKU_AM_DP1D452   |    Ean: 6970019299082   |    PartNumber: SKU_AM_DP1D452   |   Asin: B073QNSV3X

Whether it's the Moon, Jupiter or a beautiful nebula - in order to enjoy observing at the telescope you should always be comfortable. In many telescopes, that is only possible by using a star diagonal - which directs the image upwards by 45.This Astromania star diagonal has a 1.25" metal barrel. The chrome finish not only looks good, but is also practical, as the star diagonal always remains firmly attached to the focuser. The clamping screws lock the barrel firmly in place without scoring the nosepiece, as is the case with many cheaper products. In short - this barrel will keep your star diagonal in condition for virtually forever.The mirror has had everything that is possible optimised, within this price range, to ensure you enjoy a bright image - even at higher magnifications. It is the link between your eye and the telescope - and is hence just as important.Sometimes you do not want to have to re-install a filter every time you use a new eyepiece. Perhaps you might want to observe the Moon today with a range of eyepieces - but with the same filter? That is also possible due to the filter thread provided in the star diagonal.

Features

  • High quality optical Prism inside rather than a mirror which makes your image clear and sharp.
  • More comfortable viewing orientation as you observe from above, filter thread for any 1.25 filter. Accepts standard 1.25 eyepieces.
  • Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.
  • This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.
  • 1.25 45-degree mirror star diagonal for any telescope with 1.25 connector (not suitable for Newtonians).
  • See more on Amazon...

Brand: Astromania   |   Manufacturer: Astromania

Item Dimensions: 2.11 x 2.8 x 4.42 inches (5.4 x 7.1 x 11.2 cm)   |   Package Dimensions: 1.93 x 2.83 x 4.41 inches (4.9 x 7.2 x 11.2 cm)

Amazon Price: $27.99 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $27.99

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  #15

SVBONY 1.25" 90 Degree Fully Coated Erecting Prism Astronomical Telescope 31.7mm Zenith Diagonal Mirror for Refractor and Cassegrain Telescopes

Model: USW2050A   |    Mpn: FUSF9171A   |    Ean: 0635266470177   |    PartNumber: FUSF9171A   |   Asin: B00Y0NDOQK

If you are tired of trying to invert things in your mind and staring at upside down stuff;this SVBONY 90-Deg Zenith Mirror could turn your refracting telescope into a scope

It can be used to observe objects on earth with comfortable angle image;it's convenient to look at the zenith of the sky and close to horizontal observation

Main points:

1.25" 90 degree angle mirror:
Using with refractor telescope;the image is upright;though left and right reversed;not affect viewing celestial bodies

Standard 1.25" diameter:
Fit for 1.25" telescope eyepiece and telescope focuser

Designed for:
Work with refractor and catadioptric telescopes;not recommended for reflector telescope

Wide 90 degree refraction angle:
View correct image from refractor telescope stand and just look down with a comfortable angle

Super easy to use:
Just insert into 1.25" telescope at the silver end;the other end fix 1.25" eyepiece by the screw

Body material:
Plastic and metal;fully optical glass lens;provide clear and sharp image

With dust cover:
Always keep your lens clear;prolong the 90 degree zenith mirror using life

Weight:
109g;3.85oz;convenient to carry anywhere where you wanted to go

Package include:
1x90degree zenith mirror for 1.25" eyepiece

The zenith mirror is suitable for refraction and the Cassegrain telescope;not recommended for the reflector

Features

  • 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
  • Lifetime warranty;we confidently promise lifetime warranty for each one from us
  • See more on Amazon...

Brand: SVBONY   |   Manufacturer: SVBONY

Item Dimensions: 2.73 x 2.15 x 4.29 inches (6.9 x 5.5 x 10.9 cm)   |   Package Dimensions: 1.9 x 4.7 x 6.7 inches (4.8 x 11.9 x 17.0 cm)

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  #16

Orion 52055 Pentaprism 1.25" Telescope Diagonal Mirror, Black

Model: 52055   |    Mpn: 52055   |    Ean: 0759270520557   |    PartNumber: 52055   |   Asin: B07C85Z8V4

The Orion pentaprism Degree diagonal is a non-inverting, non-reversing 1.25" diagonal with a Degree viewing angle. Unlike a star diagonal, it does not produce a mirror-reversed image, which can make navigation and referring to star Maps while observing with your telescope difficult. But Unlike a correct-image diagonal, there is no image degradation caused by the ridge line where prisms intersect, which especially affects high-power viewing. It is the only diagonal that can be used with the Orion premium linear binoviewer to render an upright, non-mirror-reversed image through a telescope. So we highly recommend it for viewing with the premium linear binoviewer, especially for terrestrial applications for which a correctly oriented view is a must. The pentaprism diagonal consists of a pentagonal-shaped prism made of bk-7 glass that is multi-coated on its two transmitting surfaces and dielectric coated on its two reflective surfaces, for maximum light transmission. The pentaprism is housed in as aluminum body that features a non-marring 1.25" compression ring collar, and a tapered 1.25" barrel that is threaded for filters. The Orion pentaprism diagonal has an optical path length (back focus Requirement) of 120mm, and a generous clear aperture of 29mm. One nice feature of the pentaprism diagonal is that it causes no vignetting, even when used with long focal length, wide-angle eyepieces. When used in combination with just an eyepiece, the pentaprism diagonal will render an upside-down image, but not mirror reversed as you get with a standard star diagonal. That can be advantageous for telescopic viewing with star charts, since you need only rotate the star chart to match the view in the eyepiece. While the pentaprism is the ideal diagonal to use with the premium linear binoviewer, Note that it may not provide a correctly oriented view with other binoviewers. Try this premium quality Orion pentaprism diagonal. It's the "best and brightest" diagonal for the job!.

Features

  • The Orion pentaprism diagonal is ideal for use with the Orion Premium Linear binoviewer, because the combination renders an upright, non-mirror-reversed image
  • The pentaprism diagonal incorporates a pentagonal-shaped prism of bk-7 glass that is multi-coated and dielectric coated for maximum light transmission
  • It features a 1.25 non-marring compression ring collar and a tapered barrel for secure attachment to a telescope
  • With a generous clear aperture of 29mm, the pentaprism diagonal will not cause image vignetting, even when Used with long focal length, wide-field eyepieces
  • See more on Amazon...

Brand: Orion   |   Manufacturer: Optronic Technologies, Inc

Item Dimensions: 4.5 x 6 x 6.5 inches (11.4 x 15.2 x 16.5 cm)   |   Package Dimensions: 4.29 x 6.18 x 6.54 inches (10.9 x 15.7 x 16.6 cm)

Amazon Price: $179.99 | as of 01/17/2019(7:23pm pst)
Availibility:
List Price: $199.99 | Used Price: $164.60

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  #17

Baosity 0.965inch 24.5mm Fully Coated Eyepiece H12.5mm & H6mm + 0.965'' Telescope Prism Erecting 45-Deg Diagonal MirrorHigh Refractivity Clear Image

 Ean: 0707275297646   |    PartNumber: 62799b8ca614381e092931018caad0ed   |   Asin: B07J65CL9H

Welcome to our store. If you love Sports and Outdoor Activities ,we will provide what you want, and give your much surprise.


Description:

- 0.965"/24.5mm astronomy telescope refractor erecting prism diagonal mirror 45 degree + H12.5mm & H6mm telescope eyepiece multi-coated 0.965"/24.5mm.
- Fully Coated high quality optical glass for maximum brightness.
- High Refractivity built-in high-definition refractive prism, to create a more comfortable viewing position and clear image.
- Just insert into 0.965" telescope, and then fix the eyepiece by the screw.
- H12.5mm+H6mm Telescope Eyepiece:35 Degree Field of View: Wide viewing field with extra sharpness and long eye relief.Suitable for 0.965"/24.5mm telescope eyepiece filters.

Specification:

- Telescope Diagonal Prism Info:
- Material:Plastic + Optical Glass
- Size:80mm/3.15 inch
- Interface:0.965"/24.4mm
- H12.5mm & H6mm Eyepiece Info:
- Material: Optical Glass + Metal
- Focal Length: 12.5 mm/0.79 inch+6mm/0.23inch
- Eyepiece Port: 24.5 mm/0.965 inch

Package Includes:

1 Piece 0.965" 45 Degree Star Diagonal Mirror
1 Piece 0.965" H12.5mm Telescope Eyepiece
1 Piece 0.965" H6mm Eyepiece

Features

  • Eyepiece Port: 24.5 mm/0.965 inch
  • Focal Length: 12.5 mm/0.79 inch+6mm/0.23inch
  • Telescope Diagonal Prism Info:
  • H12.5mm & H6mm Eyepiece Info:
  • Material: Optical Glass + Metal
  • See more on Amazon...

Brand: Baosity   |   Manufacturer: Baosity

Amazon Price: $15.99 | as of 01/17/2019(7:23pm pst)
Availibility:
List Price:

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  #18

Orion 8880 1.25-Inch Dielectric Mirror Star Diagonal

Model: 8880   |    Mpn: 8880   |    Ean: 0759270088804   |    PartNumber: 8880   |   Asin: B000FA8U9S

The Orion 1.25" Dielectric Mirror Star Diagonal is an ideal choice for refractor and Cassegrain telescope owners who wish to obtain the brightest views possible while using a diagonal. This high-quality mirror diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. With such a high reflectivity diagonal, your telescopic views of starry skies will be bright, detailed and full of contrast. Dielectric mirror coatings are more durable than enhanced aluminum coatings, so you'll enjoy year after year of exceptional performance without degradation. The machined and anodized aluminum diagonal housing features machine-threaded internal baffles to ensure high-contrast performance. A non-marring compression collar is built-in to safely secure any inserted 1.25" telescope eyepiece without scratching. The diagonal's 1.25" nosepiece barrel is conveniently threaded to accept like-sized filters. Protective caps are included to keep the diagonal free of dust when not in use. Diagonals are not recommended for use with Newtonian reflector telescopes.

Features

  • 90 diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity
  • Dielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings
  • Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope
  • Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast
  • 1.25 nosepiece barrel is threaded to accept like-sized Orion eyepiece filters
  • See more on Amazon...

Brand: Orion   |   Manufacturer: Orion

Package Dimensions: 3.7 x 4.2 x 5.2 inches (9.4 x 10.7 x 13.2 cm)

Amazon Price: $88.58 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $97.70

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  #19

Astromania 2" 90-Degree Mirror Diagonal with 93% reflectivity Across Visible Spectrum

Model: SKU_AM_DM29093A   |    Mpn: SKU_AM_DM29093A   |    Ean: 6970019298054   |    PartNumber: SKU_AM_DM29093A   |   Asin: B01MYWNL8S

Astromania's 2" mirror diagonal is an excellent alternative to higher priced diagonals for those on a budget or just getting started in the 2" format. The 2" diagonal features dielectric coatings with 93% reflectivity across the visible spectrum and a 1/10 wave mirror. The all metal diagonal body is CNC machined. The combined result is a superb diagonal offering excellent mechanical and optical quality at a great price. Star diagonal is the term commonly associated with 90 mirror diagonals such as this, which let you view objects that are at a 90 angle from the direction the telescope is pointing. This allows quite comfortable viewing when the telescope is at or near the zenith. Upgrading your diagonal and switching to 2" eyepieces is one of the best investments you can make in your telescope. The wider diagonal captures more of the telescope's light cone, perfect for viewing faint, deep sky objects like nebulae and galaxies.

Features

  • It fits all rear cells of Schmidt-Cassegrain telescopes equipped with a big, 2" focuser and can use with refractor telescopes with SCT adapter which you can find in our store(NOT INCLUDE).
  • The 2 diagonal features dielectric coatings with 93% reflectivity across the visible spectrum and a 1/10 wave mirror for bright and true images.
  • Allows you to take advantage of the wider field of view provided by two inch eyepieces. Dielectric coatings are more durable than regular or enhanced aluminum coatings, so you will enjoy years of excellent performance from this product.
  • Associated with 90 mirror diagonals, which let you view objects that are at a 90 angle from the direction the telescope is pointing.
  • Improved attachment design features a brass clamping ring which does not mar, and provides a more secure connection.
  • See more on Amazon...

Brand: Astromania   |   Manufacturer: Astromania

Item Dimensions: 2.65 x 3.74 x 5.51 inches (6.7 x 9.5 x 14.0 cm)   |   Package Dimensions: 3.74 x 4.84 x 7.13 inches (9.5 x 12.3 x 18.1 cm)

Amazon Price: $65.99 | as of 01/17/2019(7:23pm pst)
Availibility: Usually ships in 24 hours
List Price: $65.99

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