No telescope type has changed the hobby quite as much as the Dobsonian. Unfortunately, the standard sizes are 1 and 2 meters in length. - posted in ATM, Optics and DIY Forum: Anyone got any plans on how to make a truss Dobsonian?I dont really want to buy the books out there and Ive seen some beautiful and simple looking home made Dobs.Thanks,Mark For this telescope, you need a PVC drain tube. It is now very cheap to purchase Dobsonian telescopes off the shelf, and fully equipped with lenses and finder scopes. Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. Plans/drawings for truss Dobsonian. At that price it is hard to justify building one. Before the introduction of the Dobsonian by John Dobson, the vast majority of amateur telescopes consisted of small telescopes with primitive mechanics - barely enough to see the polar caps of Mars or the rings of Saturn. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. Who would ever have thought ten years ago you could buy a 300mm (12 inch)Truss Tube telescope for around the $1200.00? If you can find a scrap … $450 will buy a new 150mm (6 inch) telescope. At this point, you can also buy the tube, and the altitude bearings. This is a Generation II telescope.All updates have been performed on this telescope. If you have a 150 mm F8 mirror, a 200 mm OD tube is needed. Orion SkyQuest XX12" f/4.9 Truss-Tube Dobsonian Reflector Telescope w/ parabolic primary optics 9-point flotation primary mirror cell with spring loaded thumbscrew collimation adjustments 70mm minor-axis secondary mirror on 4-vaned (0.7mm thick vanes) secondary holder 4 groups of two-pole rotatable truss assemblies with captive assembly knobs

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