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Telescope Diagonals
Give views a new angle with mirror and prism diagonals
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Telescope Diagonals

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Orion 1.25" Pentaprism Diagonal
The Orion Pentaprism 90-Degree Diagonal is the perfect complement to the Orion Premium Linear BinoViewer. It's the only diagonal we know of that will produce an upright, non-mirror-reversed view through a telescope equipped with the BinoViewer.
$199.99

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Orion Dielectric Mirror Telescope Diagonals
Orion dielectric mirror diagonals are our highest quality diagonals, and a very good upgrade for that extra bit of performance in a refractor or schmidt cassegrain telescope. Features 99 percent reflectivity and extremely durable coatings.
$99.99 - $139.99

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Orion Dielectric Twist-Tight Mirror Telescope Diagonals
With their twist-tight clamping mechanisms, Orion Dielectric Twist-Tight Mirror Star Diagonals present a significant upgrade from typical thumbscrew-equipped diagonals. Boasting 99% reflectivity, these are the perfect diagonals for peak performance.
$119.99 - $169.99
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Orion 1.25" Prism Star Telescope Diagonal
4.4 / 5.0
The 1.25" Orion Prism Star Diagonal produces right-side-up images that are reversed left to right. The fully coated prisms provide superior image fidelity. It is not recommended for use with reflector telescopes or for terrestrial observing.
$39.99
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Orion 1.25" Enhanced Mirror Star Telescope Diagonal
4.8 / 5.0
The mirror in this 1.25" Orion Enhanced Star Diagonal has been meticulously polished and features enhanced aluminum coatings to yield excellent 97% reflectivity. It fits 1.25" focusers and accepts 1.25" eyepieces. Ideal for refractor telescopes.
$79.99
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2" Orion Refractor Telescope Mirror Diagonal
5.0 / 5.0
The 2" Orion Refractor Mirror Diagonal has a meticulously polished mirror to yield maximum performance. It fits 2" focusers, accepts 2" telescope eyepieces and includes a 1.25" eyepiece adapter. Not recommended for use in reflector telescopes.
$69.99
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Orion 1.25" Correct-Image Star Telescope Diagonal
5.0 / 5.0
The 1.25" Orion Correct-Image Star Diagonal is perfect for terrestrial use or for amateur astronomers who want a view that matches the orientation of a star chart.
$49.99
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Orion 1.25" Deluxe 45-degree Correct-Image Prism Diagonal
4.7 / 5.0
Turn any refractor or Maksutov-Cassegrain telescope into a high-performance spotting scope! The Deluxe 45-degree Correct-Image Prism Diagonal transmits a right-side-up, correct left-to-right view. Not recommended for use with Newtonian reflectors.
$89.99
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Orion 1.25" 45-degree Correct Image Prism Telescope Diagonal
4.8 / 5.0
For upright, non-reversed images you need a correct-image diagonal. The Orion 45anddeg; Correct-Image Prism Diagonal is perfect for terrestrial viewing with a refractor or Cassegrain telescope. Fully multi-coated prisms give you superior image fideli
$49.99
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Meade Coronado 5mm Solar Blocking Filter Diagonal
Coronado BF-5 right angle (1.25" diagonal) type secondary blocking filter. The blocking filter is the second element in any Coronado H-alpha system, it is just as crucial to your safety and the system's performance as the front element.
$329.00

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Meade Coronado 10mm Solar Blocking Filter Diagonal
Coronado BF-10 right angle (1.25" diagonal) type secondary blocking filter. The blocking filter is the second element in any Coronado H-alpha system, it is just as crucial to your safety and the system's performance as the front element.
$499.00

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Meade Coronado 15mm Solar Blocking Filter Diagonal
Coronado BF-15 right angle (1.25" diagonal) type secondary blocking filter. The blocking filter is the second element in any Coronado H-alpha system, it is just as crucial to your safety and the system's performance as the front element.
$699.00

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Meade 1.25" 90-degree Mirror Diagonal #918A
1.0 / 5.0
Meade #918A Diagonal Mirror (1.25") #07202. Diverts light 90 degrees to the telescope's main tube, permitting a more comfortable viewing position.
$29.99
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Meade 1.25" 45-Degree Image Erecting Prism Diagonal #932
Meade Model 932 Image Erecting Prism #07210 for ETX-90 and ETX-125. Produces a correctly oriented image and convenient 45-deg observing angle for terrestrial observations.
$49.99
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Meade 1.25" 45-Degree Image Erecting Prism for Refractors
Meade Model 928 Image Erecting Prism for Meade refracting telescopes #07217. 1.25"" barrel. Produces a correctly oriented image and convenient 45-deg observing angle for terrestrial observations.
$39.99
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Meade 1.25" 45-Degree Image Erecting Prism, ETX-60, 70 & 80
Meade Model 933 Image Erecting Prism for ETX-60, ETX-70 and ETX-80 Models. Produces a correctly oriented image and convenient 45-deg observing angle for terrestrial observations. A great item for a home with a view or nature watching.
$49.99
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Meade Series 5000 2" Enhanced 90-degree Mirror Diagonal
Meade Series 5000 2"" Enhanced Diagonal Mirror #07680. Our best diagonal for Meade LX90 and LX200 models. Features an incredible 99% reflectivity over the visual spectrum.
$149.99
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Celestron 2" XLT Schmidt-Cassegrain Mirror Diagonal
4.0 / 5.0
Celestron's 2" XLT Diagonal boasts high performance StarBright XLT coatings, allowing you to take full advantage of the wider field of view provided by 2" eyepieces.
$175.95

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More About Telescope Diagonals
A telescope diagonal uses mirrors or prisms to redirect the beam of light upward — usually by 45 or 90 degrees — for more convenient viewing with refractor or Cassegrain telescopes. Orion Telescopes carries top-quality prism and mirror diagonals in both 1.25" and 2" sizes, including some with enhanced, ultra-high reflectivity optical coatings. While many diagonals produce a backwards view, our correct-image diagonals provide a correctly oriented image, which is practical for terrestrial viewing.

Please Note:
Any discounts and/or promotional offers apply only to products listed on their respective pages. Prices valid only while supplies last and are limited to stock on hand.

Products on sale or subject to promotional offers are limited to two units per customer. Large volume orders are subject to special order policies — contact our Customer Service Department for additional details.

Pricing and/or promotions are subject to change without notice.

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About Orion Telescopes & Binoculars

Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. Because we sell direct, we can offer you tremendous value at a great price. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

Orion binoculars are known for quality optics at a great price. We offer binoculars for every viewing interest, including astronomical binoculars, compact binoculars, waterproof binoculars, birding binoculars, and sport and hunting binoculars.

Orion's telescope and astrophotography accessories will enhance your telescope enjoyment without breaking the bank. Expand your viewing experience with accessories ranging from moon filters to power-boosting Barlow lenses to advanced computerized telescope mounts. Capture breathtaking photos with our affordable astrophotography cameras. And when you're stargazing, Orion's telescope cases and covers, observing gear, red LED flashlights, astronomy books and star charts will make your observing sessions more convenient, comfortable and meaningful.

At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, & reviews, and even become a featured Orion customer!