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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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Explore Scientific 2" 99% Reflective Telescope Diagonal
Explore Scientific 2" 99% reflectivity Diagonal.
$199.99
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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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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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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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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 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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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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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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Explore Scientific FirstLight MAK100 EXOS Mak-Cass Telescope
FirstLight MAK100mm White Tube Maksutov-Cassegrain with 1400mm focal length f/14 telescope with EXOS Nano EQ Mount; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$399.99
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Meade 8" f/10 LX90 ACF Telescope with Field Tripod
5.0 / 5.0
Features a 8" aperture, 2000mm focal length, and f/10 focal ratio with Dual-Fork Mounting. Equipped with Ultra High Transmission Coatings (UHTC) and a resolving power of 0.456 arc-seconds. Includes eyepiece, diagonal mirror, and tripod.
Was 
$2,599.99
Now 
$2,399.99
3 easy payments of $800.00
With payment plan
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Meade 10" f/10 LX90 ACF Telescope with Field Tripod
Features a 10" aperture, 2500mm focal length, and f/10 focal ratio with Dual-Fork Mounting. Equipped with Ultra High Transmission Coatings (UHTC) and a resolving power of 0.456 arc-seconds. Includes eyepiece, diagonal mirror, and tripod.
$3,299.99
3 easy payments of $1,100.00
With payment plan
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Meade 12" f/10 LX90 ACF Telescope with Field Tripod
Features a 12" aperture, 3048mm focal length, and f/10 focal ratio with Dual-Fork Mounting. Equipped with Ultra High Transmission Coatings (UHTC) and a resolving power of 0.456 arc-seconds. Includes eyepiece, diagonal mirror, and tripod.
$4,299.99
3 easy payments of $1,433.33
With payment plan
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Meade 16" f/10 LX200 ACF Telescope without Tripod
Features a 16" aperture, 4064mm focal length, and f/10 focal ratio. Has UHTC and a resolving power of 0.285 arc-seconds. Includes eyepiece, viewfinder, and diagonal mirror. Features AutoStar II computer with 145,000 object-library.
$16,599.99
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Meade 16" f/10 LX200 ACF Telescope with Super Giant Tripod
Features a 16" aperture, 4064mm focal length, and f/10 focal ratio. Equipped with UHTC and a resolving power of 0.285 arc-seconds. Includes Plössl eyepiece, viewfinder, diagonal mirror, and Super Giant Field Tripod.
$17,599.99
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Meade 12" f/10 LX200 ACF Telescope without Tripod
5.0 / 5.0
Features a 12" aperture, 3048mm focal length, and f/10 focal ratio with Dual-Fork Mounting. Equipped with UHTC and a resolving power of 0.380 arc seconds. Includes Plössl eyepiece, viewfinder, and 1.25" Diagonal Mirror.
$6,099.99
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Meade 14" f/10 LX200 ACF Telescope without Tripod
3.0 / 5.0
Features a 14" aperture, 3556mm focal length, and f/10 focal ratio with Dual-Fork Mounting. Equipped with UHTC and a resolving power of 0.326 arc seconds. Includes Super Plössl eyepiece, viewfinder, and 1.25" Diagonal Mirror.
$8,399.99
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Meade 8" f/10 LX200 ACF Telescope without Tripod
Features an 8" aperture, 2000mm focal length, and f/10 focal ratio with Dual-Fork Mounting. With UHTC and a resolving power of 0.570 arc seconds. Includes a 26mm eyepiece (77x), viewfinder (8x50 optical with crosshair), and diagonal mirror.
Was 
$3,999.99
Now 
$3,799.99
3 easy payments of $1,266.66
With payment plan
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Meade 10" f/10 LX200 ACF Telescope without Tripod
Features a 10" aperture, 2500mm focal length, and f/10 focal ratio with Dual-Fork Mounting. With UHTC and a resolving power of 0.570 arc seconds. Includes a 26mm eyepiece (96x), viewfinder (8x50 optical with crosshair), and diagonal mirror.
$4,599.99
3 easy payments of $1,533.33
With payment plan
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1.25" 2.5x Tele Vue Powermate
5.0 / 5.0
The 2.5x Tele Vue Powermate is parfocal in All 1 1/4" diagonals and prisms making it better than a standard Barlow. It stands less than 3" out of your focuser and with fully multi-coated lenses you get bright high contrast images.
$238.99

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Meade Polaris 90mm Equatorial Refractor Telescope
The Polaris 90 telescope includes slow-motion controls that allow for easy tracking of objects in the night sky. Includes a Red-Dot finder scope, 2x Barlow lens, three eyepieces, and erect-image diagonal. Assembled weight is approximately 18 lbs.
$299.99
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Orion Observer II 70mm Altazimuth Refractor Telescope Kit
4.0 / 5.0
This complete kit comes with everything you need to observe the night sky. Includes Observer II 70mm altazimuth telescope, 25mm and 10mm eyepieces, red-dot sight, diagonal, Shorty 2x Barlow, MoonMap 260, Telescope Observer's Guide book and more!
$129.99
If purchased separately
$179.95
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Explore Scientific 80mm Triplet ED Refractor Telescope
Explore Scientific ED80 Classic White Hoya "Essential Series" f/6 Air Spaced Triplet with FCD-1; 480mm focal length; 2" Two-Speed Rack and Pinion Focuser; 99% Reflective 2-inch Diagonal; Integrated Vixen-Style Dovetail.
$899.99
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Explore Scientific 102mm Triplet ED Refractor Telescope
Explore Scientific ED102 Classic White "Essential Series" f/7 Air Spaced Triplet with Hoya FCD-1; 714mm focal length; Two-Speed Rack and Pinion Focuser; 99% Reflective 2-inch Diagonal; Cradle Rings w/ Handle and Vixen-Style Dovetail.
$1,199.99
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Explore Scientific 127mm Triplet ED Refractor Telescope
Explore Scientific ED127 Classic White "Essential Series" f/7.5 Air Spaced Triplet with Hoya FCD-1; 952mm focal length; Two-Speed Rack and Pinion Focuser; 99% Reflective 2-inch Diagonal; Cradle Rings w/ Handle and Vixen-Style Dovetail.
$1,999.99
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Explore Scientific 80 FCD100 Triplet ED Refractor Telescope
ED80 Classic White f/6 Air Spaced Triplet with Hoya FCD100 optics and Integrated Dew Shield; 480mm focal length; 2.5" HEX Focuser; Integrated Vixen-Style Dovetail, Explore Finder Scope Base installed on scope; 99% Reflective 2" Diagonal.
$1,449.99
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Explore Scientific AR102 Refractor Telescope
Explore Scientific AR102 f/6.5 Air-Spaced Doublet; 663mm focal length; Two-Speed 2-inch Focuser; Cradle Rings w/ Handle and Vixen-Style Dovetail; 8x50 Straight Finder scope; 99% Reflective 2-inch Diagonal with 1.25-inch Adapter.
$599.99
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Explore Scientific AR127 Refractor Telescope
Explore Scientific AR127 f/6.5 Air-Spaced Doublet; 826mm focal length; Two-Speed 2-inch Focuser; Cradle Rings w/ Handle and Vixen-Style Dovetail; 8x50 Straight Finder scope; 99% Reflective 2-inch Diagonal with 1.25-inch Adapter.
$749.99
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Explore Scientific AR152 Refractor Telescope
Explore Scientific AR152 f/6.5 Air-Spaced Doublet Coatings; 988mm focal length; Two-Speed 2-inch Focuser; Cradle Rings w/ Handle and Vixen-Style Dovetail; 8x50 Straight Finder scope; 99% Reflective 2-inch Diagonal with 1.25-inch Adapter.
$979.99
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Explore Scientific FirstLight AR90 AZ Refractor Telescope
FirstLight AR90mm White Tube Refractor with 500mm focal length f/5.5 telescope with Alt/AZ "U" Yoke mount; Aluminum tripod; 1.25" draw tube focuser; 90-deg Erect Imaging Diagonal; 1.25" K9 and K20 eyepieces; HD119 Red-dot Finder; Smartphone adapter.
$159.99
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Explore Scientific FirstLight AR102 TN Refractor Telescope
FirstLight AR102mm White Tube Refractor with 600mm focal length f/6.47 telescope with Twilight Nano Alt/Az mount; 40mm draw tube focuser; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and HD132 Red-dot Finder; Smartphone Camera adapter.
$329.99
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Explore Scientific FirstLight AR102 T1 Refractor Telescope
FirstLight AR102mm White Tube Refractor with 1000mm focal length f/9.8 telescope with Twilight 1 Alt/Az mount; 2.5" Hexagonal Focuser; 2" 90-deg Diagonal; Plossl 25mm eyepiece; and HD132 Red-dot Finder; Smartphone Camera adapter.
$699.99
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Explore Scientific FirstLight AR127 T1 Refractor Telescope
FirstLight AR127mm White Tube Refractor with 1200mm focal length f/9.4 telescope with Twilight 1 Alt/Az mount; 2.5" Hexagonal Focuser; 2" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$849.99
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Explore Scientific FirstLight MAK152 T1 Mak-Cass Telescope
FirstLight MAK152mm White Tube Maksutov-Cassegrain with 1900mm focal length f/12.5 telescope with Twilight 1 Alt/Az mount; 2.5" Hexagonal Focuser; 2" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$1,199.99
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Explore Scientific FirstLight AR80 EXOS Refractor Telescope
FirstLight AR80mm White Tube Refractor with 900mm focal length f/11.25 telescope with EXOS Nano EQ Mount; 40mm draw tube focuser; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$329.99
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Explore Scientific FirstLight MAK127 EXOS Mak-Cass Telescope
FirstLight MAK127mm White Tube Maksutov-Cassegrain with 1900mm focal length f/15 telescope with EXOS Nano EQ Mount; 40mm draw tube focuser; 1.25" 90-deg Diagonal; Plossl 25mm eyepiece; and Red-dot Finder; Smartphone Camera adapter.
$529.99
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Orion VersaGo E-Series 90mm Altazimuth Refractor
4.5 / 5.0
The whole family will enjoy effortless viewing day or night! The VersaGo 90 refractor serves up stunning views of lunar craters, Saturn's rings, and cool nebulas. Comes with two Plossl eyepieces, correct-image diagonal, red dot finder, and Moon map.
$179.99
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Coronado SolarMax III 90 Double Stack Solar Scope with BF30
This high quality double stacked 90mm solar telescope features an 800mm focal length and large 30mm blocking filter. Includes rings, star diagonal, CEMAX 25mm, 18mm, and 12mm eyepiece, Sol Ranger solar finder and black and aluminum carry case.
$9,499.99
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