The Sky-Watcher Stargate Dobsonian telescopes offer serious aperture for those looking to sail farther into the depths of the cosmos in big deep-sky-gobbling apertures of 18 and 20 inches. For those stepping up from the 12-inch instruments, the 18-inch Stargate captures more than twice the light, and for those graduating from the popular 16-inch Dobs, the 20-inch gains 56-percent more.
Like the option of full go-to performance. Imagine the ability to locate and track celestial objects with nearly half a meter of aperture. Crank up the power on galaxies, clusters and nebulae without the annoying distraction of constantly re-centering your target. Sky-Watcher’s SynScan system keeps any celestial target centered while viewing.
Both big apertures feature a fused conical primary mirror and a cellular secondary mirror, a dual-speed 2-inch Crayford style focuser, two-section truss poles for ultra-compact transport, and a minimalist, all-metal design.
The 18-inch Stargate Dobsonian has a focal ratio of f/4.1 (1900-mm focal length) and a 120-mm (minor axis) secondary mirror, both of which are crafted from Borosilicate and finished with 94-percent reflective aluminum coatings. And that fast focal ratio yields an eyepiece height at Zenith of just 74.5 inches. It weighs 129 pounds fully assembled.
The 20-inch Stargate’s primary mirror has a focal ratio of f/3.95 (2000-mm focal length) and a 134-mm minor axis secondary, both with the same 94-percent coatings as the 18-inch. Eyepiece height at Zenith is 79 inches, and it weighs 138 pounds fully assembled.
The 18-inch Stargate Dobsonian is priced at $5,999US and the 20-inch Stargate at $6999US. Both include two eyepieces, a 9×50 optical finder, three 2.3-pound counter weights, a shroud and captive truss clamps, Add full go-to to either for another $1000US, featuring Freedom Find, dual encoders (which allow you to move the telescope manually without compromising alignment) and SynScan with 42,000+ object data base.
Both Sky-Watcher Stargate Truss Dobsonian are in stock and ready to go for your next observing session. For more information, visit www.skywatcherusa.com.
And to make it easier for you to get the most extensive telescope and amateur astronomy related news, articles and reviews that are only available in the magazine pages of Astronomy Technology Today, we are offering a 1 year subscription for only $6! Or, for an even better deal, we are offering 2 years for only $9. Click here to get these deals which only will be available for a very limited time. You can also check out a free sample issue here.