Sky-Watcher Flextube Dobsonians
Sky-Watcher Flextube Dobsonian telescopes are a unique design that retains some of the portability advantages of the classic truss tube design with a significant reduction in setup time. Collimation of the secondary mirror hols surprisingly well throughout several cycles of collapsing and expanding the optical tube. This differs from a classical truss tube design, where the secondary mirror collimation must be adjusted every time the telescope is assembled.