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Best Telescope Diagonals - Buying Guide

Last Updated: 04/19/2019

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Bestselling Telescope Diagonals on Amazon

  1. SVBONY 1.25" 90 Degree Zenith Diagonal Mirror for Refractor and Cassegrain Telescopes Astronomical ...
  2. Astromania 1.25" 90-Degree Erecting Prism Optical Prism Inside Rather Than a Mirror which Makes Your...
  3. Orion 1.25" Twist-Tight Dielectric Mirror Star Diagonal
  4. Celestron 2-Inch XLT Diagonal Mirror (for SCT Telescope)
  5. SVBONY 1.25" 90 Degree Zenith Mirror Diagonal Adapter Erect Image Fully Metal for Refracting Telesco...
  6. Baader Planetarium 2-Inch Clicklock Mirror Diagonal Eyepiece
  7. Astromania 1.25" 90-Degree Diagonal Mirror - More Comfortable Viewing Orientation as You Observe fro...
  8. SVBONY 1.25" 45 Degree Erecting Image Diagonal Zenith Mirror for Refractor Catadioptric Telescope an...
  9. 1.25" 90 Degree Star Diagonal, Erect Image Zenith Mirror, Fully Coated for Refracting Telescope Eyep...
  10. William Optics 2" Dura Bright Diagonal w/ Carbon Fiber Plates D-DIG2D-C-DB

  #1

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

Model: FUSW2239A   |    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
  • 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
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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)

Warranty: Lifetime warranty;we confidently promise lifetime warranty for each one form us

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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.
  • 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: 2.3 x 2.6 x 4.5 inches (5.8 x 6.6 x 11.4 cm)

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  #3

Orion 1.25" 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)

First Available: 2018-12-12

Warranty: Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

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  #4

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)

Warranty: 2 Year accessories warranty

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  #5

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

Model: FUSF9171A   |    Mpn: W2560   |    Ean: 0794604981253   |    PartNumber: W2560   |   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
  • See more on Amazon...

Brand: SVBONY   |   Manufacturer: SVBONY

Item Dimensions: 2.17 x 3.35 x 5.51 inches (5.5 x 8.5 x 14.0 cm)   |   Package Dimensions: 0.7 x 2.7 x 6.9 inches (1.8 x 6.9 x 17.5 cm)

Warranty: Lifetime warranty;we confidently promise lifetime warranty for each one form us

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  #6

Baader Planetarium 2-Inch Clicklock Mirror Diagonal Eyepiece

Model: 2956100   |    Mpn: 2956100   |    Ean: 0962392002201   |    PartNumber: 2956100   |   Asin: B002SYBF8M

High quality, beautifully crafted star diagonal.The highly accurate mirror is not hindered by its ultra reflective coatings as many similar models are, in some models up to 1/2 a wave accuracy is lost due to the layers of coatings, this is not the case with Baaders all-dielectric mirror coatings.Your eyepieces are protected from marks and scratches by Baaders innovative clicklock clamp system, a simple 20 degree twist is all it takes to secure your eyepieces. Oversized 2" dielectric 1/10 wave mirror Scratch resistant hard coated mirror surface for safe cleaning, to remain scratch free even if subjected to harsh environment Mirror rejects deep UV and IR radiation safe for solar viewing with all White-Light and H-Alpha Solar Filters Largest possible clear aperture for widefield application Smooth outer shape without sharp corners Baader ClickLock 2" Clamp for ultrafast clamping action Clamps heavy accessories effortless, with fingertip action 2" nosepiece with large clear aperture, removeable

Features

  • Oversized 2" dielectric 1/10 wave mirror
  • Scratch resistant hard coated mirror surface for safe cleaning, to remain scratch free even if subjected to harsh environment
  • Mirror rejects deep UV and IR radiation safe for solar viewing with all White-Light and H-Alpha Solar Filters
  • Largest possible clear aperture for widefield application
  • Clamps heavy accessories effortless, with fingertip action
  • See more on Amazon...

Brand: Baader-Planetarium   |   Manufacturer: Baader Planetarium

Item Dimensions: 4.13 x 4.33 x 6.5 inches (10.5 x 11.0 x 16.5 cm)   |   Package Dimensions: 4.09 x 4.33 x 6.54 inches (10.4 x 11.0 x 16.6 cm)

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  #7

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)

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  #8

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

Model: FUSW2560A   |    Mpn: W2560   |    Ean: 0714559073797   |    PartNumber: W2560   |   Asin: B071CKG619

SVBONY 45 degree erecting image diagonal prism for telescope and any standard 1.25" eyepiece

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

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
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
Type: zenith mirror
Observation angle: 45 degrees
Color black and silver
Net weight: 75.50g
Gross weight 96.90g
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
  • See more on Amazon...

Brand: SVBONY   |   Manufacturer: SVBONY

Item Dimensions: 2.9 x 2.14 x 4.29 inches (7.4 x 5.4 x 10.9 cm)   |   Package Dimensions: 2.36 x 4.65 x 6.93 inches (6.0 x 11.8 x 17.6 cm)

Warranty: Lifetime warranty;we confidently promise lifetime warranty for each one form us

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  #9

1.25" 90 Degree Star Diagonal, Erect Image Zenith Mirror, Fully Coated for Refracting Telescope Eyepiece Lens

Model: DM90   |    Mpn: DM90   |    Ean: 0711102632470   |    PartNumber: DM90   |   Asin: B07PWH4W76

If you are tired of trying to invert things in your mind and staring at upside down stuff, this GazerOptics 90 Degree Star Diagonal could turn your refracting telescope into a scope.

High Quality

All glasses are fully coated for additional light transmission, greatly improves the clarity of the edge images.

Comfortable Observation

A diagonal that is angled at 90 helps avoid neck strain when looking through the eyepiece. It can be used to observe objects with comfortable angle.

Standard 1.25" Diameter

Fit for standard 1.25" telescope eyepiece and telescope focuser.

Designed For

Work with refractor and catadioptric telescopes, not recommended for reflector telescope.

PLEASE note that though this 90 diagonal displays images that are right side up and left to right orientation will be reversed, but also not affect astronomical observation.

P.S: Our product is produced to provide years of enjoyment for you. If you have any question about the product and service, please feel free to contact us. We will do our best to solve problem.







Features

  • Fully Coated for additional light transmission, greatly improves the clarity of the edge images.
  • Comfortable observation with 90-degree, avoid neck strain when looking through the eyepiece.
  • Protective coating on the mirror to ensure a long life, metal barrel - for secure seating in the focuser.
  • Standard 1.25'' diameter; fit for any 1.25'' focuser and eyepiece.
  • Work with refractor telescopes; not recommended for reflector telescopes.
  • See more on Amazon...

Brand: GazerOptics   |   Manufacturer: GazerOptics

Item Dimensions: 2.36 x 1.61 x 3.93 inches (6.0 x 4.1 x 10.0 cm)   |   Package Dimensions: 2.05 x 2.99 x 3.15 inches (5.2 x 7.6 x 8.0 cm)

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  #10

William Optics 2" Dura Bright Diagonal w/ Carbon Fiber Plates D-DIG2D-C-DB

Model: 3216595509   |    Mpn: D-DIG2D-C-DB   |    Ean: 0962392012125   |    PartNumber: D-DIG2D-C-DB   |   Asin: B00FATACUY


Introducing the New William Optics 2014 Dura-Bright diagonal - a dramatic step forward in the evolution of mirror diagonals!
This 90 2"mirror-type star diagonal has a Dura-Bright 12mm thick mirror, 1/10 or better wave surface accuracy, and dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations. Features a 2" nosepiece for insertion into refractor telescopes and other 2" focuser barrels.
Dura-Bright features 100% real carbon fiber side plates that add that touch of class your scope deserves. It is William Optics' highest end mirror diagonal and designed for high-end scopes such as FLT-98, FLT-110 and FLT-132.
The WO 2" Dura-Bright Diagonal was designed with several unique features to provide optimum performance and years of use.
Top-Notch Performance and brightness
Dielectric coating allows 99% reflectivity.
High precision 12mm thick mirror substrate flat for optimal image stability.
Polished to 1/10th wave or better accuracy.
Accurate design guarantees constant alignment. No further alignment needed.
Meticulous Craftsmanship
2" to 1.25" eyepiece adapter included.
Lock screw for eyepiece/adapter.
Big, knurled thumbscrews are easy to turn even with gloves on.
Threaded for 48mm filters.
Compression rings (both on diagonal and adapter) to prevent barrels from marring.
Internal safety stop prevents 2" barrels from hitting the mirror.
Strikingly Beautiful
Patented, elegant design.
High-quality machining out of the best aluminum.
Internal anti-reflection baffling for highest contrast.
Real Carbon Fiber side plates

Features

Brand: William Optics   |   Manufacturer: William Optics

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  #11

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)

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  #12

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)

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  #13

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
  • See more on Amazon...

Brand: Orion   |   Manufacturer: Orion

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

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  #14

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)

First Available: 2018-12-12

Warranty: Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

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  #15

Astromania 2" SCT 90-Degree Mirror Diagonal with 93% reflectivity Across Visible Spectrum - fits Rear Cells of Schmidt-Cassegrain telescopes and Includes an Adapter to use with Refractor telescopes

Model: SKU_AM_DM29093   |    Mpn: SKU_AM_DM29093   |    Ean: 6970019295770   |    PartNumber: SKU_AM_DM29093   |   Asin: B01MA44UIQ

Astromania's 2" SCT 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" SCT 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. You can attach this diagonal directly to Schmidt-Cassegrain telescopes and many Maksutov-Cassegrain telescopes, as long as there is a SCT male thread on the telescope. The standard SCT thread is a 2"x24tpi thread.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 and includes an adapter to use with refractor telescopes.
  • The 2 SCT 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.
  • The SCT Adapter has a standard SCT female thread (2, 24 TPI),you can use your refractor diagonal with all telescopes having a standard SCT thread for which you can attach this diagonal directly to Schmidt-Cassegrain telescopes and many Maksutov-Cassegrain telescopes.
  • 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: 4.13 x 7.28 x 7.68 inches (10.5 x 18.5 x 19.5 cm)

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  #16

Alstar 1.25" 90-degree Erecting Prism optical Prism inside rather than a mirror which makes your image clear and sharp

Model: SKU_AM_EP1D90AR   |    Mpn: SKU_AM_EP1D90AR   |    Ean: 6970019299792   |    PartNumber: SKU_AM_EP1D90AR   |   Asin: B074DQR9ZN

1.25" 90-degree diagonal features an image erecting prism that allows you to look into a telescope at a 90 degree angle. It produces an image that is oriented properly, which means that the image is upright and correct from left to right (i.e., a correct, non-inverted, non-reversed image).This is a great diagonal for daytime terrestrial use with small telescopes or spotting scopes. It can also be used for astronomy applications, especially when you would like to match the orientation of the star field with "correct" star maps and charts. The prism housing is made of precision molded ABS plastic and the two end barrels are precision machined from aluminum. The 1.25" nosepiece is threaded to accept standard 1.25" astronomy filters. Please Note: This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. It not meant for use with Newtonian / Dobsonian reflector telescopes or other variants of Newtonian telescopes.

Features

  • With this diagonal you can match the orientation of the star field with "correct" star maps and charts. It produces an image that is oriented properly, which means that the image is upright but reversed left to right.
  • 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, filter thread for any 1.25 filter. Accepts standard 1.25 eyepieces.
  • High quality optical Prism inside rather than a mirror which makes your image clear and sharp.
  • Economical 1.25 90-deg prism diagonal for astronomical telescopes and spotting scopes.
  • 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: 2.5 x 2.8 x 4.9 inches (6.4 x 7.1 x 12.4 cm)

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  #17

Astromania 2" 45-Degree Erecting Prism Diagonal for Telescope

Model: SKU_AM_DP2D45   |    Mpn: SKU_AM_DP2D45   |    Ean: 6970019292953   |    PartNumber: SKU_AM_DP2D45   |   Asin: B01B2OR23U

Precision Prism - Image erecting BAK4 prism with anti-reflection coating. - High accuracy and high light reflection prism. - Brass compression ring. Superior Craftsmanship - Internally matte blackened and threaded for no internal stray light reflection. - Threaded for 2" filters. Ready to Go - 1.25" adapter with brass compression ring included. - Large, chromed thumbscrews. Beautiful Finish - Entirely aluminum, black anodized. - Smooth finish. Features: - Prism: High quality BAK4 with anti-reflection coating - Materials: Entirely machined aluminum - Angle: 45 degree - Prism clear aperture: 31mm - 2"-1.25" adapter with brass compression rings. If there is any problem of focusing due to the light path for a few telescopes, please feel free to contact us for help.

Features

  • Image erecting BAK4 prism with anti-reflection coating.
  • High accuracy and high light reflection prism.
  • Internally matte blackened and threaded for no internal stray light reflection.
  • 1.25 adapter with brass compression ring included.
  • 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.
  • See more on Amazon...

Brand: Astromania   |   Manufacturer: Astromania

Item Dimensions: 3.8 x 4.87 x 7.23 inches (9.7 x 12.4 x 18.4 cm)   |   Package Dimensions: 3.8 x 4.9 x 7 inches (9.7 x 12.4 x 17.8 cm)

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  #18

1.25" 45-Degree Erect Image Prism Diagonal for Telescope, 31.7mm Optical Prism Inside Rather Than a Mirror

Model: DM45   |    Mpn: DM45   |    Ean: 0711102632487   |    PartNumber: DM45   |   Asin: B07PXP924R

If you are tired of trying to invert things in your mind and staring at upside down stuff; this GazerOptics 90 Degree Diagonal Prism could turn your refracting telescope into a scope.

High Quality

The prism is made of genuine optically processed BAK7 glass, high quality optical 31.7mm prism inside rather than a mirror which makes your image clear and sharp.

Comfortable Observation

It can be used to observe objects with comfortable angle; it's convenient to look at the zenith of the sky and close to horizontal observation. It produces an image that is oriented properly, which means the image is upright and correct from left to right.





Wide Range of Uses

This is a great diagonal for daytime terrestrial use with small telescopes or spotting scopes. It can also be used for astronomy applications, especially when you would like to match the orientation of the star field with 'correct' star maps and charts.

Reliable Guarantee

We provide 30-Days no reason return and 12-Month warranty. If you have any question about product and service, please feel free to contact us, we will do our best to solve problem.







Features

  • High quality 31.7mm 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 prism 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.
  • Work with refractor and catadioptric telescopes; not recommended for reflector telescope.
  • See more on Amazon...

Brand: GazerOptics   |   Manufacturer: GazerOptics

Item Dimensions: 2.36 x 1.41 x 3.38 inches (6.0 x 3.6 x 8.6 cm)   |   Package Dimensions: 2.05 x 2.99 x 3.15 inches (5.2 x 7.6 x 8.0 cm)

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  #19

Serounder Dielectric Mirror, 1.25 Inch 90-Degree Dielectric Mirror Diagonal for Telescope

 Ean: 0736342466692   |    PartNumber: Seroundermwgib6e7zs   |   Asin: B07PSJ9RH9

Specification:
Condition: 100% Brand new
Material: Aluminum alloy+Stainless steel
Color: As shows in pictures
Size: 6.5*3.5*3cm / 2.56*1.38*1.18in
Gross Weight: 136g / 4.8oz

Package List:
1* Dielectric Mirror

Notice:
Please allow slight error due to manual measurement and make sure you do not mind before ordering.
Please understand that colors may exist chromatic aberration as the different placement of pictures.

Features

  • All-surface multilayer coated prism system.
  • Used for 1.25 inch focus seat and 1.25inch eyepiece.
  • Interface with 1.25 inch thread can be connected with 1.25in filter.
  • Constructed with aluminum alloy housing and stainless steel cover plate, available for long lifespan.
  • Not recommended for use in reflective telescopes.
  • See more on Amazon...

Brand: Serounder   |   Manufacturer: Serounder

Item Dimensions: 1.18 x 1.38 x 2.56 inches (3.0 x 3.5 x 6.5 cm)   |   Package Dimensions: 1.18 x 1.38 x 2.56 inches (3.0 x 3.5 x 6.5 cm)

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  #20

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
  • See more on Amazon...

Brand: Orion   |   Manufacturer: Orion

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

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