Dobsonian Telescopes | The Absolute Best Bang for Your Buck
20 inch diameter refracting telescope from Warner and Swasey, nicknamed Rachel, originally installed at Chabot Observatory in 1914 and now used at the Chabot Space and Science Center, a science museum and
Obsession Telescopes / Telescopes / 20" Classic
A "Classic" Big Dobsonian - The 20" Obsession Telescope - Go Big or Go Home! - YouTube
Obsession 20 inch dobson F5 - Telescopes
Clyde Bone and His Two Unusual Mersenne Telescopes! – Tele Vue Optics, Inc. Blog
UL20
Bob Bunge's TJ2 - Story of a 20-inch Dobsonian Telescope, the history of a 20+ year old Dobsonian
Moore Observatory Remote/Robotic Telescope
What can I expect from a 20" Dobsonian? - Major & Minor Planetary Imaging - Cloudy Nights
What can I expect from a 20" Dobsonian? - Major & Minor Planetary Imaging - Cloudy Nights
DesignApplause | Max 20″ acf. Meade telescope.
Imaging Planets with the 20-inch Aperture Telescope – Aperture Telescopes