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

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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 - $189.99
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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.
$89.99 - $139.99

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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.
$37.99

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Orion 1.25" Enhanced Mirror Star Telescope Diagonal
4.9 / 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.
$69.99

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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.
$79.99

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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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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.
$39.99

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Orion 1.25" Deluxe 45-degree Correct-Image Prism Diagonal
4.6 / 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.
$79.99

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More About Orion 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.