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With the largest light bucket in the series, the Sky-Watcher Stargate 20" f/3.9 Truss-Tube 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 makes 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.
truss-tube construction and simple assembly enable a virtually complete
breakdown for easier transportation and storage, with an assembly time
of less than 20 minutes. To help block stray peripheral light and
internal reflected light, Sky-Watcher includes a ribbed fabric shroud
that completely covers the open trusses, giving users the convenience of
the truss system with the performance of traditional solid tubes. The
rocker box weighs in at 70 pounds and provides a rock-steady
observational platform with very low vibration.