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.
Learn MoreFREE SHIPPINGModel#: 5864(48 States)
The astro-photographer will be especially pleased with the high contrast images through this telescope and the full objective diameter of 4". The ED115S comes complete with 125mm tube rings and Vixen's New Dual Speed Focuser. Covered by a 5 Year Warranty. Manufactured in Japan.... Learn MoreFREE SHIPPINGModel#: 5866(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. The new ED lenses feature brighter images from the shorter f/7.7 focal ratio and capture crisp, pinpoint star images for your eye’s enjoyment.... Learn MoreFREE SHIPPINGModel#: 5865(48 States)