With the largest light bucket in the series and the added convenience of a fully motorized GoTo mount, the Sky-Watcher Stargate 20" f/3.9 Truss-Tube GoTo Dobsonian Telescope
gives users exceptional performance with a low dollar-to-aperture cost.
Proprietary aluminum mirror coatings ensure maximum reflectivity, and a
fused conical parabolic primary mirror design allows for thinner mirror
construction. This provides faster cooling and lighter weight while
also correcting spherical aberration to eliminate distortion across the
entire field of view, especially at the edges.
telescope's large 20" aperture draws in a tremendous amount of light to
reveal awe-inspiring details of the Moon and planets. Deep-sky objects
will be visible even for inexperienced observers and bright star
clusters can be resolved to their core. Its f/3.9 focal ratio and
dual-speed Crayford focuser make this an ideal choice for imaging. The
fast focal ratio enables devices to capture images in less time than
slower scopes, while the focusing mechanism gives it the ability to
achieve tack-sharp focusing with zero backlash that rack-and-pinion
focusers are generally unable to accomplish. This 2" focuser will accept
larger eyepieces so users can enjoy a truly immersive visual experience
and will ensure larger imaging sensors are completely covered.
micro-stepper motors and a worm-wheel/timing belt transmission move the
optical tube assembly smoothly without vibrations. Digital encoders on
each axis keep track of the mount's position, even when moved manually,
to maintain its alignment for easier usability. Controlling the mount is
the SynScan computer hand controller. Outfitted with a database of over
42,900 objects including the sun, Moon, planets, galaxies, nebulae, and
stars, the controller features multiple alignment procedures to help
get users observing faster. A Deep Sky Tour takes users on an automatic
tour of the night sky, showing them the best celestial objects overhead
on any given day and time. Periodic Error Correction (PEC), Pointing
Accuracy Enhancement (PAE), and anti-backlash compensation functions aid
the user in correcting the play between gears and the intrinsic errors
in the mount and software to improve tracking, slewing, pointing, and
GoTo accuracy over time. The intuitive menu-driven system is easy to use
by beginners and experienced users alike.