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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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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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Explore Scientific 2" 99% Reflective Telescope Diagonal
Explore Scientific 2" 99% reflectivity Diagonal.
$169.99
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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" 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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1.25" Orion Dielectric Mirror Star Diagonal
4.8 / 5.0
The 1.25" dielectric mirror star diagonal angles the eyepiece to a comfortable viewing position, while dielectric coatings give you brighter images compared to a standard star diagonal. The harder surface from the coatings also makes cleaning easier.
$99.99
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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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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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2" Orion Dielectric Mirror Star Diagonal
4.9 / 5.0
The 2" Orion Dielectric Mirror Star Diagonal boasts 99% reflectivity giving you very bright images. It is very durable and includes a 2"-1.25" adapter so you can use all your 1.25" and 2" eyepieces.
$139.99
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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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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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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 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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Orion 2" Twist-Tight Dielectric Mirror Star Diagonal
5.0 / 5.0
With its twist-tight clamping mechanism, the Orion 2" Dielectric Twist-Tight Mirror Star Diagonal presents a significant upgrade from typical thumbscrew-equipped diagonals. Boasting 99% reflectivity, this is the perfect diagonal for peak performance.
$169.99

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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" 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" Twist-Tight Dielectric Mirror Star Diagonal
This high-end diagonal features 99% reflectivity and a twist-tight clamping mechanism to securely grasp inserted 1.25" accessories with a simple clockwise twist of its red aluminum collar.
$119.99
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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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