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.
The astro-photographer will be especially pleased with the high contrast images through this telescope and the full objective diameter of 4".... Learn MoreFREE SHIPPINGModel#: 5866(48 States)
When The ED81S was introduced , it set a new standard for APO Refractors. The combination of better color correction from the new ED glass and brighter images from its fast f/7.... Learn MoreFREE SHIPPINGModel#: 5864(48 States)
The newly designed high definition ED lens in Vixen's ED103S Refractor gives excellent optical performance in a short optical tube for easy handling.... Learn MoreFREE SHIPPINGModel#: 5865(48 States)