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Top 10 best dielectric mirror diagonal for 2024

Finding the best dielectric mirror diagonal suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.

Best dielectric mirror diagonal

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Meade Instruments 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter (Black) Meade Instruments 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter (Black)
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Orion 8727 2-Inch Dielectric Mirror Star Diagonal Orion 8727 2-Inch Dielectric Mirror Star Diagonal
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Orion 2 Orion 2" Twist-Tight Dielectric Mirror Star Diagonal
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Orion 1.25 Inch Twist-Tight Dielectric Mirror Star Diagonal Orion 1.25 Inch Twist-Tight Dielectric Mirror Star Diagonal
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Astromania 2 Astromania 2" 90-Degree 99% Enhanced Dielectric Diagonal Mirror - Provide a Much Brighter Image Than with an Ordinary Star Diagonal
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Orion 8880 1.25-Inch Dielectric Mirror Star Diagonal Orion 8880 1.25-Inch Dielectric Mirror Star Diagonal
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Explore Scientific DD02-00CF 2-inch  Dielectric-Coated Diagonal Mirror with 1.25-inch Adapter Explore Scientific DD02-00CF 2-inch Dielectric-Coated Diagonal Mirror with 1.25-inch Adapter
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Omegon Carbonline 2'', 90 Mirror Star Diagonal, 99% Dielectric Omegon Carbonline 2'', 90 Mirror Star Diagonal, 99% Dielectric
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FidgetFidget Telescope 45-deg Dielectric Mirror Diagonal for Astronomical + 1.25 FidgetFidget Telescope 45-deg Dielectric Mirror Diagonal for Astronomical + 1.25" Adapter QFC
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Baader Planetarium 2 inch Clicklock Mirror Diagonal 295 Baader Planetarium 2 inch Clicklock Mirror Diagonal 295
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1. Meade Instruments 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter (Black)

Feature

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

Description

The Meade 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter uses multi-layered dielectric coatings that produce 99-percent reflectivity for brighter, sharper images. This slip fit 2-inch diagonal with 1.25-inch adapter, plus the Schmidt Cassegrain thread to 2-inch accessory adapter (for LS, LT, LX90, LX200 and other Schmidt Cassegrain rear thread screw-on systems), is compatible with both slip-fit and screw-on mounting systems. This items non-marring compression safety secures the eyepieces. The optics are made with Pyrex glass and comes with dielectric coatings for the most light transmission possible. This item has been interferometer-tested for excellent performance. The Meade 07680 Series 5000 2-Inch Enhanced Dielectric Diagonal Mirror with Schmidt-Cassegrain Adapter comes with a full 1-year Meade factory limited warranty. Meade has everything you need to capture the night sky for experienced star-shooters, serious researchers and beginners alike. Serious astronomers for years have flocked to Meade telescopes for their quality optical systems and patented technology. Consumers know that "Meade Optics Inside" means that what they see through our telescopes will be views that are detailed, crisp and full of contrast. Look through a Meade this evening and see what you've been missing.

2. Orion 8727 2-Inch Dielectric Mirror Star Diagonal

Feature

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

Description

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.

3. Orion 2" Twist-Tight Dielectric Mirror Star Diagonal

Feature

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

Description

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

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

Feature

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

Description

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.

5. Astromania 2" 90-Degree 99% Enhanced Dielectric Diagonal Mirror - Provide a Much Brighter Image Than with an Ordinary Star Diagonal

Feature

2" Diagonal Mirror with 99% reflection, optics are made with Pyrex glass.
Multi-layered dielectric coatings that produce 99-percent reflectivity for brighter, sharper images.
Comes with dielectric coatings for the most light transmission possible.
Suitable for refractors, Schmidt-Cassegrains, ACF, EdgeHD and Maksutov-Cassegrains.
2" - 1.25" reducing sleeve with brass compression ring, non-marring compression safety secures the eyepieces.

Description

Astromania 2" 90-degree 99% Enhanced Dielectric Diagonal Mirror uses multi-layered dielectric coatings in order to guarantee a maximum reflection of 99% with the highest contrast and optimal sharpness.The residual stress in the plane mirror which can occur with the dielectric vapour deposition process is ruled out here. This slip fit 2-inch diagonal with 1.25-inch adapter, plus the Schmidt Cassegrain thread to 2-inch accessory adapter and other Schmidt Cassegrain rear thread screw-on systems, is compatible with both slip-fit and screw-on mounting systems. The optics are made with Pyrex glass and comes with dielectric coatings for the most light transmission possible. Beside eyepieces, a star diagonal is one of the most important accessories. What is the use of a good objective or the best eyepiece if the star diagonal is inferior? We recommend the Astromania 2" 90-degree 99% Enhanced Dielectric Diagonal Mirror to everyone, including those working with high end instruments. The star diagonal permits full illumination of 2" wide field eyepieces.

6. Orion 8880 1.25-Inch Dielectric Mirror Star Diagonal

Feature

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

Description

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.

7. Explore Scientific DD02-00CF 2-inch Dielectric-Coated Diagonal Mirror with 1.25-inch Adapter

Description


The Explore Scientific 2" Dielectric Diagonal is a nice light weight diagonal. The engineers at Explore Scientific were able to achieve weight savings when compared to traditional diagonals replacing some of the base material with carbon fiber material. This simultaneously lightens and strengthens the diagonal. All mirror surfaces have dielectric coatings to enhance reflectivity. Equipped with a 2" to 1.25" adapter this diagonal can accept both 2" and 1.25" eyepieces. Overall this is a great diagonal for the money!

8. Omegon Carbonline 2'', 90 Mirror Star Diagonal, 99% Dielectric

Description

The power of the golden ring - premium mirror star diagonal with Twist-Lock system for a strong yet gentle grip

Safely attach your accessories! The Omegon 2" or 2" SC Twist-Lock star diagonal (depending on the model) attaches eyepieces, cameras and adapters as if they were welded to the telescope. One quick twist is enough, and your eyepiece is firmly but gently both attached and centred.

The advantages in a nutshell

- mirror star diagonal with Twist-Lock - automatically centres your accessory

- no clamping screws - your accessories extremely tightly gripped but will not be damaged.

- bright images - 99% reflection mirror coating, so you can see everything that's there.

- carbon-fibre look - carbon-fibre side-walls

- 2''/1.25'' adapter with centring clamp

Change accessories with a single twist

It has never been easier! You can now change your accessories in the blink of an eye, and even in darkness, with a certainty that was never possible with mirror star diagonals attached via a clamping screw. Insert your eyepiece into the star diagonal, twist the fluted golden ring - and already the eyepiece sits there, rock solid.

Nothing slips or wobbles here - not even by a millimetre! The big advantage - gentle clamping and precisely centred accessories.

How is it different to other mirror star diagonals?

In a standard mirror star diagonal, a clamping screw is used to fix the accessory in place. But if screwed too tight it can leav an ugly scar on the eyepiece barrel. And who wants that, when they have spent a several hundred euros on their eyepiece or camera? Your accessories will always keep their value when used with this mirror star diagonal.

Dielectric mirror - bright, high-contrast images

The Omegon mirror sta

9. FidgetFidget Telescope 45-deg Dielectric Mirror Diagonal for Astronomical + 1.25" Adapter QFC

Description

Features

Interface size: 1.25 inches (31.7mm)

Viewing angle: 45 degrees

Thread size: M28 * 0.6mm

Imaging direction: all positive mirror

Mirror body material: plastic (black part)

Interface Material: Metal (silver part)

Prism material: optical glass

Net weight: 69G

Gross weight: 76G

10. Baader Planetarium 2 inch Clicklock Mirror Diagonal 295

Description


The Baader Planetarium 2" Clicklock Mirror Diagonal is one of the top 2" diagonals on the market today. The quality that Baader incorporates within all of their products is on display with the release of their new Diagonal.

Like its predecessor, the 2" Clicklock Star Diagonal uses the proprietary Baader Dielectric mirror coatings. The Baader coating process eliminates the Achilles Heel that has plagued other all-dielectric mirror coatings - normally the multi-layer coating results in high surface stresses that cause a star diagonal's mirror to warp as much as 1/2 wave, ruining the figure and distorting the optical wavefront. Baader's proprietary coating process maintains the 1/10 wave mirror surface accuracy - After Coating!

Baader's Dielectric coatings deliver an amazingly high 99% photo-visual reflectivity along with an extremely hard durable surface. The Maxbright mirror coatings will last lifetimes without losing reflectivity, and may be cleaned with normal care, without fear of scratches. The precision mirror is also over sized, and combines with the large ID nose piece to pass the largest image cone possible in a 2" format.

The new 2" Clicklock non-marring eyepiece holder delivers the same acclaimed simplicity and security as its smaller 1.25" Clicklock cousin. With an effortless twist of the rubber knurled ring (which also includes a convenient fingertip lever) , the clicklock holder clamps 2" eyepieces so securely you can lift your scope with them. The unique action utilizes 3-point clamping which positively and accurately locks 2" eyepieces without any of the wobbling and misalignment that can occur with single point clamps.

Conclusion

By our suggestions above, we hope that you can found the best dielectric mirror diagonal for you. Please don't forget to share your experience by comment in this post. Thank you!

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