Editing Dobsonian telescope (section)

===Collapsible tube assemblies===
"Classic" design tube assemblies would require a large van for transport. Designers started coming up with disassembleable or collapsible variants that could be brought to the site with a small [[sport utility vehicle|SUV]], [[hatchback]], or even a [[sedan (car)|sedan]]. This innovation allowed the amateur astronomy community access to even larger apertures.

====The truss tube====
Many designs have combined the advantages of a light [[truss]] tube and a collapsible design. Collapsible "truss tube" Dobsonians appeared in the amateur telescope making community as early as 1982<ref>{{cite magazine |title=An Extremely Portable 17{{citefrac|1|2}}" Dobsonian |author=Hamberg, Ivar |magazine=Telescope Making |issue=17 |date=Fall 1982}}</ref><ref>{{cite web |url=http://web.telia.com/~u82002652/Galaxies/Obs/Dobson.htm |website=telia.com |title=The 17.5" Dobsonian |author=Hamberg, Ivar |url-status=dead |access-date=2009-02-25 |archive-date=2011-05-26 |archive-url=https://web.archive.org/web/20110526011517/http://web.telia.com/~u82002652/Galaxies/Obs/Dobson.htm }}</ref> and allow the optical tube assembly, the largest component, to be broken down. As the name implies, the "tube" of this design is actually composed of an upper cage assembly, which contains the secondary mirror, and focuser, held in place by several rigid poles over a mirror box which contains the objective mirror. The poles are held in place by quick-disconnecting clamps which allow the entire telescope to be easily broken down into its smaller components, facilitating their transport by vehicle or other means to an observing site. These truss tube designs are sometimes incorrectly called a ''[[Serrurier truss]]'', but since the main truss is not built with an opposing mirror cell truss it only performs one function of that design, i.e. keeping the optics parallel.