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 - 77 ED II f/4.6 Astrograph Set (2178 + 7150 + 7137 + 7753 + 7835 + 7870)
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FREE SHIPPINGModel#: B07746(48 States)
$1,695.00 -
Borg - 45 ED II f/5 Astrograph Set (6045 + 7857 + 7885)
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FREE SHIPPINGModel#: B04561(48 States)
$850.00 -
Borg - 125 SD f/6.5 Astrograph Set (9125 + 7835 + 7108)
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FREE SHIPPINGModel#: B12565(48 States)
$4,190.00 -
Borg - 125 SD f/3.9 Astrograph Set (9125S + 7835 + 7704)
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FREE SHIPPINGModel#: B12539(48 States)
$4,950.00 -
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



















