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Telescope Diagonals

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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 - $149.99

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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 - $179.99
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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 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.
$79.99
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Orion 1.25" Deluxe 45-degree Correct-Image Prism Diagonal
4.8 / 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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Meade 1.25" Mirror Star Telescope Diagonal
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.
$39.99
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Meade Series 5000 2" Enhanced 90-degree Mirror Diagonal
Our best diagonal for Meade LX90 and LX200 models. Features an incredible 99% reflectivity over the visual spectrum.
$179.99
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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.