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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" Mirror Star Telescope Diagonal
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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Explore Scientific 2" 99% Reflective Telescope Diagonal
Explore Scientific 2" 99% reflectivity Diagonal.
$199.99
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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
4.9 / 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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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.
$149.99
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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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Orion 2" Twist-Tight Dielectric Mirror Star Diagonal
4.3 / 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.
$179.99

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Orion 1.25" Twist-Tight Dielectric Mirror Star Diagonal
5.0 / 5.0
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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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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Coronado BF-5 5mm Solar Blocking Filter
The Coronado BF-5 right angle (1.25" diagonal) type secondary 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.
$429.99

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Coronado BF10 10mm Solar Blocking Filter
Coronado BF10 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.
$579.99
3 easy payments of $193.33
With payment plan

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2"-to-1.25" Orion Telescope Eyepiece Adapter
4.5 / 5.0
The 2"-to-1.25" Orion Eyepiece Adapter allows you to use 1.25" telescope eyepieces in any 2" focuser, star diagonal, or holder.
$24.99

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2" 4.0x Tele Vue Powermate
5.0 / 5.0
The 2" 4x Tele Vue Powermate is a better choice than a standard barlow for 2" diagonals because it is nearly parfocal. It is excellent with all 1.25" and 2" telescope eyepieces, but especially good with long eye-relief 2" eyepieces.
$359.99

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1.25" 5.0x Tele Vue Powermate
5.0 / 5.0
The 5x Tele Vue Powermate is ideal for long focus CCD and film photography and is a high performance alternative to eyepiece projection. It is parfocal in all 1.25" diagonals and prisms making it better than a standard Barlow.
$238.99

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Coronado BF15 15mm Solar Blocking Filter
Coronado BF15 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.
$779.99
3 easy payments of $260.00
With payment plan

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Meade 2" Accessory Adapter for Meade ACF and SCT Telescopes
Converts the rear cell thread of the telescope to a 2" slip fit, allowing use of 2" accessories such as 2" slip fit diagonals and 2" eyepieces on Meade LX90 and LX200 models of all years and sizes.
$119.99

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Explore Scientific FirstLight MAK100 TN Mak-Cass Telescope
FirstLight MAK100mm White Tube Maksutov-Cassegrain with 1400mm focal length f/14 telescope with Twilight Nano Alt/Az mount; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$379.99
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Explore Scientific FirstLight MAK127 TN Mak-Cass Telescope
FirstLight MAK127mm White Tube Maksutov-Cassegrain with 1900mm focal length f/15 telescope with Twilight Nano Alt/Az mount; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$499.99
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Explore Scientific FirstLight MAK127 T1 Mak-Cass Telescope
FirstLight MAK127mm White Tube Maksutov-Cassegrain with 1900mm focal length f/15 telescope with Twilight 1 Alt/Az mount; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$849.99
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