The 6 Best Mirror diagonals (2023 reviews)

We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate diagonal. The astromania mirror diagonal is exactly that - it's a simple diagonal that hits all the right notes. Dielectric coatings are more durable than regular or enhanced aluminum coatings, so you will enjoy years of excellent performance from this product. It fits all rear cells of Schmidt-cassegrain telescopes equipped with a big, 2" focuser and can use with refractor telescopes with sct adapter asin. It features a brass clamping ring which does not mar, and provides a more secure connection. It makes observations quite comfortable when the telescope is at or near the zenith.

The 2" diagonal features dielectric coatings with 93% reflectivity across the visible spectrum and a 1/10 wave mirror for bright and true images. The nose piece and eyepiece holder both have the same threading so are interchangeable. It comes with dielectric coatings for the most light transmission possible. It makes the structure more durable.

Why We Like This:

Fogs up when the humidity is higher than
Edge to edge clarity with no noticeable distortions or abberations
Good investment for long term

Serounder Mirror Diagonal

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It is a very good diagonal with a clear image. It is constructed with aluminum alloy housing and stainless steel cover plate, available for long lifespan. The image is inverted (upside down) as these diagonals usually do and it is clear, in focus. It is used for 1.25 inch focus seat and 1.25inch eyepiece.

Why We Like This:

Delivers what they promise
Good investment for long term

Astromania correct image

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Astromania line of diagonal come in a pretty wide variety of styles, so you can definitely find one that suits your individual preferences and needs. The diagonal mirror is designed for use with telescopes that have a 1.25 inch diameter optical path. It provides a comfortable 90 degree view from your refractor. The high quality of the mirror makes the image seen clearer and brighter. The two mirror tubes are made of metal to make the structure stronger and more durable.

The diagonal is well worth it and value is terrific. It is threaded for filters. It is fits for a 1.25" eyepiece and telescope. The image is sharper, cleaner, and brighter.

Why We Like This:

Gets the job done with smaller budget telescopes
Protective coating on the mirror to ensure a long life
Delivers what they promise

William optics Mirror Diagonal

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The william optics mirror diagonal is satisfactory and appropriate and fits well with your daily usage. The 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. It features a 2" nosepiece for insertion into refractor telescopes and other 2" focuser barrels. It provides higher contrast and resolution during critical planetary, lunar and binary star observations.

The Dura-Bright features 100% real carbon fiber side plates that add that touch of class your scope deserves. The bright diagonal is designed with several unique features to provide optimum performance and years of use. It allows 99% reflectivity additionally it is easy to turn even with gloves on. It is a big improvement over a basic meade or celestron.

Why We Like This:

High precision 12mm thick mirror substrate flat for optimal image stability
Heavy duty, crystal clear, safely shipped
Very well made item, very nice optics
Big, knurled thumbscrews are easy to turn even with gloves on

Astrostreet Mirror Diagonal

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The astrostreet mirror diagonal is the best reliable diagonal on the market today. The body is made of CNC machined aluminum with a beautiful finish and excellent rigidity.

Why We Like This:

Lot of satisfied buyers
Good brand reputation

Xccyg Mirror Diagonal

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Best part: xccyg mirror diagonal costs comparatively low and it is available to ship in 24 hours.

Why We Like This:

Work with refractor and catadioptric telescopes
Made of aluminum alloy and durable
Fully coated lens come with dust cover