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Telescope Optical Tube Assemblies

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Orion 8" f/4 Newtonian Reflector Astrograph
Buckle up, because this is one fast astrograph! Its prodigious light grasp (200mm aperture) and zippy f/4 focal ratio combine to capture tremendous detail and light with short exposures from DSLR or dedicated astro cameras. Super affordable, too!
$699.99
3 easy payments of $233.33
With payment plan
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Orion 10" f/4 Newtonian Reflector Astrograph
With its big 10" aperture and 1000mm focal length, this fast f/4 astrophotographic powerhouse will take your imaging to an exciting new level. And it's way more affordable than premium "apo" refractors with just a fraction of its aperture.
$899.99
3 easy payments of $300.00
With payment plan
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Orion EON 115mm ED Triplet Apochromatic Refractor Telescope
5.0 / 5.0
The Orion EON 115mm Triplet ED Apochromatic Refractor features exquisite optics and mechanics for the discerning observer and imager. Features a 2.5" focuser, twist lock compression rings, sliding dew shield, and includes a hard case for transport.
$1,699.99
3 easy payments of $566.66
With payment plan
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Orion EON 130mm ED Triplet Apochromatic Refractor Telescope
5.0 / 5.0
The Orion EON 130mm Triplet ED Apochromatic Refractor features exquisite optics and mechanics for the discerning observer and imager. Features a 2.5" focuser, twist lock compression rings, sliding dew shield, and includes a hard case for transport.
$2,699.99
3 easy payments of $900.00
With payment plan
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Orion 80mm ED Semi-Apo Binocular Spotting Scope
Enjoy two-eyed viewing with this premium 80mm ED Semi-Apo spotting scope with rotatable binocular viewer and two 12.5mm (40x) Orion Edge-On eyepieces. Incredible 3D-like depth of field. Great for terrestrial or wide-field astronomical pursuits.
$1,399.99
3 easy payments of $466.66
With payment plan
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Orion ED80T CF Triplet Apochromatic Refractor Telescope
4.6 / 5.0
The Orion ED80T CF is perfect for the amateur astrophotographer and visual enthusiast. This 80mm aperture apochromatic refractor provides true to color views and images. It is light weight and portable so you can view and photograph anywhere.
$999.99
3 easy payments of $333.33
With payment plan
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Orion 8" f/8 Ritchey-Chretien Astrograph Telescope
5.0 / 5.0
This 8" aperture Ritchey-Chretien optical tube is ideal for the advanced astrophotographer using small format CCD cameras and DSLRs. Offers a wide, fully illuminated field with pinpoint star clarity and includes an array of high-end features.
$1,199.99
3 easy payments of $400.00
With payment plan
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Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
4.9 / 5.0
In the Orion ED80 Apo Refractor, images appear extremely sharp with no false color. This telescope is suited for viewing both planetary and deep-sky objects as well as for astrophotography. Perfect for the intermediate observer or astrophotographer.
$599.99
3 easy payments of $200.00
With payment plan
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Orion 180mm Maksutov-Cassegrain Telescope Optical Tube
5.0 / 5.0
Superb high-power performance, compact lightweight design, sharp high-contrast view, and clearly defined astrophotography capabilities make the Orion 180mm Maksutov-Cassegrain perfect for the advanced planetary observer or astrophotographer.
$1,299.99
3 easy payments of $433.33
With payment plan
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Orion Apex 127mm Maksutov-Cassegrain Telescope
4.9 / 5.0
Outstanding image quality, incredible range of use, and portability make the Apex 127mm Mak-Cass perfect for the intermediate viewer. Use with any mount or tripod for nightitme or daytime viewing.
$499.99
3 easy payments of $166.66
With payment plan
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Orion Apex 102mm Maksutov-Cassegrain Telescope
4.7 / 5.0
The compact yet powerful Orion Apex 102mm Maksutov-Cassegrain telescope is great for observers wanting to get fantastic views during the night or day. Small enough that you can tuck it into a daypack or store it on a bookshelf.
$329.99
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Orion ShortTube 80 Refractor Telescope Optical Tube Assembly
4.8 / 5.0
As a guide scope for long-exposure astrophotography or as a wide-field visual telescope, the "ST80 OTA" is a pint-sized powerhouse. Sold without accessories, this versatile 80mm f/5 achromatic refractor is ready to customize to your needs.
$129.99
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Orion EON 85mm ED-X2 f/6.6 Triplet Apo Refractor Telescope
4.0 / 5.0
Featuring two ED glass elements for remarkable true-color performance, the Orion EON 85mm ED-X2 Triplet Apo Refractor will satisfy even the most demanding astrophotographers and observers. Includes hard case, 2" dual-speed focuser, and more.
$1,899.99
3 easy payments of $633.33
With payment plan
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Orion 150mm Maksutov-Cassegrain Telescope Optical Tube
4.9 / 5.0
The compact Orion 150mm Mak-Cass Telescope Optical Tube Assembly (OTA) opens up new vistas of the celestial landscape for your viewing pleasure, putting superior resolving power at your disposal. Sold as OTA only, without accessories.
$799.99
3 easy payments of $266.66
With payment plan
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Orion EON 104mm ED-X2 f/6.25 Triplet Apo Refractor Telescope
5.0 / 5.0
With two ED glass elements for remarkable true-color performance, the Orion EON 104mm f/6.25 ED-X2 Triplet is certain to satisfy your "apo" appetite. Features a 2.7" dual-speed focuser, and includes a hard case, tube rings, dovetail bar and more.
$2,599.99
3 easy payments of $866.66
With payment plan
Compare

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Orion 6" f/4 Newtonian Astrograph Reflector Telescope
4.3 / 5.0
With fast f/4 optics and 94% reflectivity coatings, this 6" Newtonian Astrograph acquires high-resolution images of deep-sky objects with short exposure times so you can get great results quickly. Includes 8x50 finder, hinged tube rings and more.
$499.99
3 easy payments of $166.66
With payment plan
Compare

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Orion 120mm f/5.0 Refractor Telescope Optical Tube Assembly
4.8 / 5.0
This compact large-aperture f/5 refractor telescope is perfect for wide-field views and deep-sky pursuits. Weighing in at just 8.6 pounds, the 120mm f/5 Refractor OTA makes a great portable telescope for astronomers on-the-go.
$299.99
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Orion 10" f/8 Ritchey-Chretien Astrograph Telescope
Go after even the most elusive and faint deep-sky targets with the Orion 10" f/8.0 Ritchey-Chretien Astrograph. Featuring flat-field, virtually coma-free optics for superb imaging performance, the Orion 10" RC boasts a plethora of deluxe features.
$2,799.99
3 easy payments of $933.33
With payment plan
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Orion 6" f/9 Ritchey-Chretien Astrograph Telescope
4.7 / 5.0
This compact 6"-aperture Ritchey-Chretien optical tube provides advanced astrophotography performance at an incredible price. It is ideal for use with small-format CCD cameras as well as DSLR cameras for deep-sky and solar system astrophotography.
$699.99
3 easy payments of $233.33
With payment plan
Compare

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Orion CT80 80mm Compact Refractor Telescope Optical Tube
3.3 / 5.0
The fully coated Orion CT80 refractor is a compact, 80mm aperture telescope optical tube that delivers bright, wide-field views. Great for use as a guide scope, or for daytime viewing and stargazing. All accessories sold separately.
$109.99
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Orion 254mm f/4.7 Reflector Telescope Optical Tube Assembly
4.8 / 5.0
Do you already own an equatorial mount? Add the Orion 254mm optical tube to get vivid, close-up views of deep-sky and solar system objects. This telescope includes a prime-focus camera adapter for astrophotography.
$529.99
3 easy payments of $176.66
With payment plan
Compare

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Orion StarBlast 62mm Compact Travel Refractor Telescope
5.0 / 5.0
Extremely portable at 3.1lbs. and just over a foot long with its lens shade retracted, the finely crafted StarBlast 62mm Compact Travel Refractor packs a ton of performance into its small telescope body and can be used for any type of observing.
$449.99
3 easy payments of $150.00
With payment plan
Compare

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Orion ED66 CF Carbon Fiber Refractor Telescope
5.0 / 5.0
Featuring fully multi-coated FPL-51 ED glass optics, a dual-speed Crayford focuser and a carbon fiber optical tube, the Orion ED66 CF Refractor is an amazingly versatile telescope capable of delivering true-color views day or night.
$799.99
3 easy payments of $266.66
With payment plan
Compare

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Orion ShortTube 80-T Refractor Telescope
4.7 / 5.0
This compact, grab-and-go 80mm refractor is outfitted for enjoyable daytime terrestrial viewing and casual nighttime stargazing. Just pop it on a telescope mount or photo tripod and start exploring! Includes high- and low-power Plossl eyepieces.
$199.99
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Orion Apex 90mm Maksutov-Cassegrain Telescope
4.7 / 5.0
The Orion Apex 90mm Maksutov-Cassegrain telescope is both high-power and compact - perfect for the beginner for both astronomy and terrestrial viewing. The correct-image finder scope makes locating objects easy.
$249.99
Compare

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Orion EON 110mm ED f/6.0 Apochromatic Refractor Telescope
4.4 / 5.0
Back by popular demand with upgrades, the EON 110mm ED boasts two-element ED optics, 2.7" hybrid-drive RandP focuser, and now twist-tight 2" and 1.25" accessory collars for convenience and security. Superb f/6 astrograph or wide-field visual scope!
$1,399.99
3 easy payments of $466.66
With payment plan
Compare

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Orion 10" Truss Tube Ritchey-Chretien Astrograph
Our 10" f/8 Truss Tube Ritchey-Chretien combines low-expansion quartz mirror optics, a Serrurier carbon fiber truss system, and a CNC-machined 3.3" dual-speed linear bearing focuser in what can only be described as an astrophotographic powerhouse.
$3,499.99
3 easy payments of $1,166.66
With payment plan
Compare

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Orion 12" Truss Tube Ritchey-Chretien Astrograph
5.0 / 5.0
Our 12" f/8 Truss Tube Ritchey-Chretien combines low-expansion quartz mirror optics, a Serrurier carbon fiber truss system, and a CNC-machined 3.3" dual-speed linear bearing focuser in what can only be described as an astrophotographic powerhouse.
$4,499.99
3 easy payments of $1,500.00
With payment plan
Compare

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Orion ShortTube 80-A Refractor Telescope
4.7 / 5.0
The Orion ST80-A compact refractor may just be the perfect telescope for family stargazing fun. With wide-field 80mm f/5 optics, all-aluminum optical tube, and an array of great accessories, it's one "astronomical" value! Just add your own mount.
$199.99
Compare

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Meade 10" f/8 ACF Optical Tube Assembly
10" OTA has a fast f/8 optical system with high-contrast, with pinpoint imaging to the edge of the field. Features an internal zero image shift Crayford-style focusing system with a two-speed 7:1 reduction control.
$2,899.99

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Meade 12" f/8 ACF Optical Tube Assembly
12" OTA has a fast f/8 optical system with high-contrast, with pinpoint imaging to the edge of the field. Features an internal zero image shift Crayford-style focusing system with a two-speed 7:1 reduction control.
$3,999.99

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Meade 16" f/8 ACF Optical Tube Assembly
16" OTA has a fast f/8 optical system with high-contrast, with pinpoint imaging to the edge of the field. Features an internal zero image shift Crayford-style focusing system with a two-speed 7:1 reduction control.
$9,499.99

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Meade 8" f/10 ACF Optical Tube Assembly
ACF optics achieve aplanatic performance, with a flatter field, reduced astigmatism and eliminated diffractions spikes. Has UHTC coatings, Losmandy-style dovetail, Dust Cover and more!
$1,399.99

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Meade 10" f/10 ACF Optical Tube Assembly
ACF optics achieve aplanatic performance, with a flatter field, reduced astigmatism and eliminated diffractions spikes. Has UHTC coatings, Losmandy-style dovetail, Dust Cover and more!
$2,199.99

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Meade 12" f/10 ACF Optical Tube Assembly w/UHT
ACF optics achieve aplanatic performance, with a flatter field, reduced astigmatism and eliminated diffractions spikes. Has UHTC coatings, Losmandy-style dovetail, Dust Cover and more!
$3,599.99

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Meade 14" f/10 ACF Optical Tube Assembly
ACF optics achieve aplanatic performance, with a flatter field, reduced astigmatism and eliminated diffractions spikes. Has UHTC coatings, Losmandy-style dovetail, Dust Cover and more!
$6,499.99

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Meade 16" f/10 ACF Optical Tube Assembly
ACF optics achieve aplanatic performance, with a flatter field, reduced astigmatism and eliminated diffractions spikes. Has UHTC coatings, Losmandy-style dovetail, Dust Cover and more!
$8,999.99

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Coronado Personal Solar Telescope
4.8 / 5.0
For safe viewing of the sun, the Meade Coronado Personal Solar Telescope is perfect. This H-alpha scope reveals dramatic prominences, flares, and other solar phenomena. Very light weight, this scope only requires a small tripod for support.
$799.99

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Coronado 0.5 Angstrom Personal Solar Telescope
This 40mm diameter highly portable dedicated solar telescope features a superior 0.5 Angstrom bandpass for increased surface detail. Study of the solar disk is now within the reach of the amateur astronomer.
$1,399.99
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Coronado SolarMax III 70 Solar Scope with BF10
This high quality 70mm solar telescope features a 400mm focal length, f/5.7 focal ratio, and 10mm blocking filter. Includes mounting rings, Cemax 18mm eyepiece, Sol Ranger solar finder and black and gold aluminum hard carry case.
$2,699.99

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Coronado SolarMax III 70 Double Stack Solar Scope with BF15
70mm solar telescope with a 400mm focal length, f/5.7 focal ratio, 15mm blocking filter, and 60mm external Hydrogen-alpha Etalon double-stack with T-max Tuner. Includes mounting rings, 18mm eyepiece, Sol Ranger finder and aluminum carry case.
$3,699.99

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Coronado SolarMax III 90 Solar Scope with BF15
Telescope with enhanced rack and pinion focuser and large external etalons is the perfect way to view the Sun! Includes 12mm, 18mm, 25mm eyepieces, CEMAX 2x barlow, Sol Ranger finder, Vixen-style dovetail mounting rail, and aluminum carry case.
$4,999.99

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Coronado SolarMax III 90 Double Stack Solar Scope with BF15
90mm telescope with enhanced rack and pinion focuser and large external etalons is the perfect way to view the Sun! Includes 12mm, 18mm, 25mm eyepieces, CEMAX 2x barlow, Sol Ranger finder, Vixen-style dovetail mounting rail, and aluminum carry case.
$6,999.99

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Coronado SolarMax III 90 Double Stack Solar Scope with BF30
90mm telescope with enhanced rack and pinion focuser and large external etalons is the perfect way to view the Sun! Includes 12mm, 18mm, 25mm eyepieces, CEMAX 2x barlow, Sol Ranger finder, Vixen-style dovetail mounting rail, and aluminum carry case.
$7,999.99

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Coronado SolarMax III 70 Double Stack Solar Scope with BF10
70mm F/5.7 refractor equipped with 60mm H-a filters. Available in single and double stack bandpasses, and either 10mm or 15mm blocking filters. Has two-speed rack and pinion focuser which creates a more user-friendly interaction with the telescope.
$3,399.99

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Coronado SolarMax III 70 Solar Scope with BF15
70mm F/5.7 refractor equipped with 60mm H-alpha filters. Available in single and double stack bandpasses, and either 10mm or 15mm blocking filters. Has two-speed rack and pinion focuser which creates a more user-friendly interaction with the telescop
$2,799.99

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Coronado SolarMax III 90 Solar Scope with BF30
90mm F/8.9 refractor equipped with 90mm H-alpha filters. Available in single and double stack bandpasses, and either 15mm or 30mm blocking filters. Two-speed rack and pinion focuser which creates a more user-friendly interaction with the telescope.
$5,999.99

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More About Telescope Optical Tube Assemblies
Orion Telescopes sells a variety of telescope optical tube assemblies (OTAs) for those who already own a suitable telescope mount or camera tripod. Many of these telescope optical tubes are offered without accessories to allow you to outfit them with telescope accessories you may already own. Adding a new telescope optical tube assembly is a great way to expand your observing or astrophotography repertoire!

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.