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- Product Series
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- Astro-Tech ED Doublet Refractor Telescopes (1)
- Celestron EdgeHD Optical Tube Assemblies (5)
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- Celestron Schmidt-Cassegrain Aluminum Optical Tube Assemblies (9)
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Optical Tube Assemblies
Optical tube assemblies, commonly abbreviated by astronomers as OTAs are simply the tube of the telescope where the optics are internally located. OTAs can be helpful in a situation in which an observer has a compatible mount and doesn't want to buy a whole new telescope with a mount included. Optical Tube Assemblies can come in the form of Maksutov-Cassegrain, Astrographs, Reflectors, Refractors, Schmidt-Cassegrains and many others! With the right mounting connections and range of mount and tripod payload, OTAs are a great choice for changing optical type without changing the mount.
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Borg - 71 ED II f/4.3 Astrograph Set (2178 + 7135 + 7835 + 7704)
- BORG 77EDII OTA
- 0.65x reducer
- Total of 6 elements
- 330mm focal length
- F4.3
- 35mm full-frame coverage
FREE SHIPPINGModel#: B07743(48 States)
$2,175.00 -
ASA - 200mm Hyperbolic Astrograph
... Learn More
Model#: 8HSOK3ZK
Regular Price: $11,235.00
Special Price: $9,999.00
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Astro-Tech - Black 72mm f/6 ED Doublet Refractor OTA
Astro-Tech has built this optical tube by increasing their previous aperture of 66mm to a now 72mm. This allows 9% higher resolution and 19% better light gathering. In addition, a new and updated focuser has been supplied with this telescope.
... Learn MoreFREE SHIPPINGModel#: AT72BK(48 States)
$379.00 -
Astro-Tech - Blue 72mm f/6 ED Doublet Refractor OTA
... Learn More
FREE SHIPPINGModel#: AT72BL(48 States)
$379.00 -
Astro-Tech - Green 72mm f/6 ED Doublet Refractor OTA
This green optical tube from Astro-Tech is a piece of equipment every advanced serious astronomer should consider. With high quality refractive optics, fabulous accessories, it is pretty amazing. Some of the key features of this item include the dual speed rotating focuser (10:1 ratio focusing) and high quality ED optics great at preventing chromatic aberration. This scope is so high key, Astronomy magazine designated it previous version a “a great grab-and-go scope, a fine little astrograph, a super-finder scope, and a daytime spotting scope.”. Now, Astro-Tech has added even more to the picture.
... Learn MoreFREE SHIPPINGModel#: AT72GR(48 States)
$379.00 -
Astro-Tech - Red 72mm f/6 ED Doublet Refractor OTA
... Learn More
FREE SHIPPINGModel#: AT72R(48 States)
$379.00 -
Astro-Tech - White 72mm f/6 ED Doublet Refractor OTA
... Learn More
FREE SHIPPINGModel#: AT72WH(48 States)
$379.00 -
Borg - 125 SD f/3.9 Astrograph Set (9125S + 7835 + 7704)
... Learn More
FREE SHIPPINGModel#: B12539(48 States)
$4,950.00 -
Borg - 125 SD f/6.5 Astrograph Set (9125 + 7835 + 7108)
... Learn More
FREE SHIPPINGModel#: B12565(48 States)
$4,190.00 -
Borg - 45 ED II f/5 Astrograph Set (6045 + 7857 + 7885)
... Learn More
FREE SHIPPINGModel#: B04561(48 States)
$850.00 -
Borg - 77 ED II f/4.6 Astrograph Set (2178 + 7150 + 7137 + 7753 + 7835 + 7870)
... Learn More
FREE SHIPPINGModel#: B07746(48 States)
$1,695.00 -
Celestron - C-11CF Optical Tube Assembly
... Learn More
FREE SHIPPINGModel#: 91035-XLT(48 States)
$2,165.00 -
Celestron - C11-A XLT (CGE) Optical Tube Assembly
Celestron C-11A OTA with Starbright XLT.
... Learn MoreFREE SHIPPINGModel#: 91036-XLT(48 States)
$1,695.00 -
Celestron - C11-A XLT OTA (CG-5)
11" Schmidt-Cassegrain Optical Tube AssemblyAluminum Optical TubeCelestron's premium StarBright XLT coatings2800 mm focal length (f/10)40 mm eyepiece included (70x)Visual back allows for use with 1
... Learn MoreFREE SHIPPINGModel#: 91067-XLT(48 States)
$1,895.00 -
Celestron - C14-A XLT (CGE) Optical Tube Assembly
... Learn More
FREE SHIPPINGModel#: 91037-XLT(48 States)
Regular Price: $5,099.00
Special Price: $3,999.00
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Celestron - C14-AF XLT (CGE) Optical Tube Assembly
... Learn More
FREE SHIPPINGModel#: 91038-XLT(48 States)
$5,599.00 -
Celestron - C5 Spotting Scope
Celestron's C5 Spotting Scope is a 5" (127mm) aperture, 1250 mm f/10 Schmidt-Cassegrain optical system. Its optical excellence is the reason it was chosen by NASA for many space shuttle missions.
... Learn MoreFREE SHIPPINGModel#: 52291(48 States)
$549.95 -
Celestron - C6 Acromat Refractor Optical Tube Assembly (for CG-5)
This is a discontinued item. We suggest the C6 Acromat Refractor OTA as a replacement.
An excellent choice for the serious astronomer, the C6-R is the largest telescope in its class with over 6 times the light gathering ability of a 60mm
... Learn MoreFREE SHIPPINGModel#: 21020-OTA(48 States)
$599.00 -
Celestron - C6-A-XLT (CG-5) Optical Tube Assembly
... Learn More
FREE SHIPPINGModel#: 91010-XLT(48 States)
$649.95 -
Celestron - C6-N Newtonian Optical Tube Assembly
- 1.25" focuser
- Mounting rings
- 6x30 Finderscope
- 20mm Plossl
Model#: 31056-OTA
$199.00
