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.
Explore Scientific - ED102 Air Spaced Carbon Fiber Triplet Refractor Telescope with Bresser EXOS2GT Mount
Explore Scientific uses ED (Extra-low Dispersion) FCD1 (Dense Fluor Crown) glass developed and manufactured by Hoya Optical of Japan.
This German Equatorial mount is equipped with motors on both axes, allowing the mount to track astronomical objects accurately. The precision gears allow operation with a minimum of backlash on all nine slewing speeds.Learn MoreFREE SHIPPINGModel#: EDT10207CF-EXOS2GT(48 States)
An excellent refractor for those searching for a great quality lens with the best design and parts, all in one item yet compact, lightweight and highly portable.... Learn MoreFREE SHIPPINGModel#: BLACK-90T(48 States)
Celestron C-11A OTA with Starbright XLT.... Learn MoreFREE SHIPPINGModel#: 91036-XLT(48 States)
The Explore Scientific 127mm f/7.5 Air-Spaced Triplet ED APO produces a visual experience that is often compared to much larger aperture reflector telescopes.Learn MoreFREE SHIPPINGModel#: EDT-127075-CF(48 States)
Meade 115mm ED Triplet APO Refractor #4507-00-05. For crisp wide field observing and imaging, nothing can beat a true triple-element Apochromatic Refractor (APO)... Learn MoreFREE SHIPPINGModel#: 4507-00-05(48 States)
FREE SHIPPINGModel#: B07743(48 States)
- BORG 77EDII OTA
- 0.65x reducer
- Total of 6 elements
- 330mm focal length
- 35mm full-frame coverage