At present, CCD imaging is being done with a carbon fiber truss, 12-1/2” f/4 corrected Newtonian telescope I completed building in 2008. It was quite a challenge, and involved a bit of custom design and fabrication of truss plates, truss components, etc. The results have been an extremely stable focus and a vert rigid OTA structure.
On this scope, the imaging train is a 3” Keller corrector, PDF focuser, and Sbig STL11000 camera with AstroDon L,R,G,B, and Ha filters installed. The primary mirror is a 12-1/2” f/4 from R.F. Royce and a 5” secondary mirror from Ostahowski Optics.
This all sits atop a Paramount ME, utilizing a variety of software for control and acquisition including TheSky6/Tpoint, MaximDL, FocusMax, AAG Tpoint Mapper, PinPoint Astrometric engine, and CCDautopilot.