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Skywatcher 18" Stargate Collapsible Goto Dobsonian Telescope

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  • Truss tube
  • Borosilicate aluminised mirrors protected by quartz coating
  • Aluminium structure and base
  • Diffraction Limited Parabolic Mirror
  • Ultra Thin Secondary Mirror Support (only 2.50mm)
  • M42 Thread for DSLR Connection
  • Backed by 5 Years Sky-Watcher Limited Warranty

Sky-Watcher 18″ Truss Tube GoTo Telescope

The Stargate Dobsonians represents the ultimate combination between light gathering, precision and portability for outstanding performance and resolution. The truss structure is compact, allowing for easy transportation while you’re in search of the perfect dark, pristine sky. The outstanding light gathering of the mirror and the superior resolution allow amazing journeys through the universe, offering spectacular observations of tangled gas filaments in nebulae, fine galaxy details and remarkable planet structures. Despite the size of the mirror, the telescope is easy to assemble following the step by step instructions and video.

To top it off, the Sky-Watcher Stargate is equipped with a 2″ Crayford dual speed focuser for smooth and precise focusing, and a focuser-locking screw.

Parabolic Primary Mirror

The most extraordinary feature of the Stargate is the technology used in the mirrors. They are made up of borosilicate glass that has a very low expansion coefficient, reducing the stresses caused by thermal gradients. The primary mirror uses a special lightweight technology. In fact, the mirror is extremely light and thin, but the glass ribs beneath minimise the glass deformation, thus allowing continuous high performance in all the telescope angulations. Moreover, the small thickness of the mirror allows a much quicker cooling time compared to the standard monolithic mirrors. The secondary mirror has a honeycomb structure that follows the concept of the primary mirror: lightweight, rigid and quick to cool down.

Both the mirrors are aluminised and in order to protect the reflective treatment over the years, the coatings are protected by a thin layer of quartz (silicon dioxide). This protection is needed as the mirrors are exposed to external elements due to their position in an open truss tube. Sky-Watcher is one of the few companies in the world that use this particular technology.

Computerised Synscan

The Stargate Go-To is equipped with the Sky-Watcher SynScan that has in it’s memory 42,900 objects! Once the telescope is aligned, thousands of objects will be visible with a touch of a button; planets, the entire Messier catalogue, bright and double stars and the IC, NGC, SAO catalogues. In addition to this, the Deep Sky Tour function suggests a list of the most interesting deep sky objects so even the inexperienced astronomer can easily observe faint nebulae and galaxies.

The Freedom Find technology (dual-encoder) allows the telescope to be moved manually whenever the user wishes, but without losing any of the pre-set alignment.

Accessories in the Box:

  • SynScan hand controller with cables
  • 12V power cable with lighter socket plug
  • Finderscope 9X50 straight version
  • Eyepiece 2″ LET 28mm (68x) – apparent field of view 56°
  • Eyepiece 1.25″ Super Plossl 10mm (190x) – apparent field of view 52°
  • Eyepiece adapter from 2″ to 1.25″ with M42 thread
  • 2″ tube extension
  • Collimation Eyepiece
  • User Manual


For amateur astronomers seeking superior equatorial control and the ease of a high-precision computerised Go-To telescope mounting system for imaging or visual applications, the family of SynScan TM Pro Series mountings are the answer. All SynScan TM Pro Series models are premium-grade observing platforms which have been thoughtfully designed for ease of operation. With the user-friendly push-button hand control, locating and viewing the treasures of the night sky becomes a walk in the park. The SynScan TM hand control allows you to point the telescope at a specific object or tour the skies at the touch of a button. The user friendly menu system allows automatic slewing to over 42,900 objects. Even an inexperienced astronomer can master its variety of features in a few observation sessions.


  • SynScan Computerised Handset
    Features include ongoing firmware updated from the internet. Pointing accuracy enhancement (PAE), and capacity to store star alignment data. Accepts GPS Mouse for convenient entry of time, date and location.
  • 42,900+ Object Database
    Including planets, named stars, double-stars, variable stars & user defined objects.
  • Object Catalogues
    Messier, IC, NGC & Caldwell
Optical Design Newtonian (parabolic primary mirror)
Aperture 458mm (18″)
Focal Length 1900mm
Focal Ratio f/4.1
Secondary mirror diameter 120mm
Obstruction 26.2%
Resolving Power 0.26″
Stellar Limit Magnitude 16.0
Highest Practical Magnification 916X
Light gathering power (compared to the unaided eye) 4281X
Focuser 2″ Crayford dual speed with 1.25″ adaptor

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