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Sky-Watcher Stargate 500 SynScan f/3.9 Dobsonian

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  • Regular price $7,999.00

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  • Aperture: 20-Inch
  • Focal Length: 2000 mm
  • Focal Ratio: f/3.95
  • Focuser: Dual Speed 2-Inch Crayford
  • Special Feature: Go-To Equipped with 42,900+ Object Database
  • Best suited for: High end visual observation



Sky-Watcher Stargate 500 SynScan f/3.9 Dobsonian


The Stargate 500 SynScan 200-Inch Truss Dobsonian:

Sky-Watcher has opened a portal to the stars with the new Stargate 20-Inch (508 mm) aperture Truss-Tube Dobsonian telescope. This telescope designed for immense light gathering power and ease of use, and is sure to deliver on both fronts for the most discerning of visual astronomers. With a maximum useful magnification of 1000x, you will find that the Sky-Watcher Stargate 20-Inch Dobsonian makes it easy and enjoyable to scour planetary and deep sky visual targets for the most refined and subtle of details. The Stargate 20-Inch is somewhat larger than its 18-inch sibling, but Sky-Watcher still estimates that it should take no longer than thirty minutes for an experienced astronomer to assemble and render it ready for observational use under normal circumstances.

And of course, it's not just raw power and convenience that Sky-Watcher prioritized when designing and making the Stargate 20-inch. They also made sure to include a primary parabolic mirror design that eliminates the spherical aberrations that are otherwise inherent in faster focal length reflectors. These mirrors are designed to bring all of the light your telescope has gathered to a single focal point and ensure sharp, high contrast, high detail images. Every optical mirror in the Stargate, including the parabolic primary mirror, is fully multi-coated with high quality Silicon Dioxide coatings that ensure optimal durability and performance.

This model has been upgraded with Sky-Watcher's Syn-Scan Go-To system to help you make the most out of this extraordinary telescope. The included Go-To system permits motorized operation in both the Altitude and Azimuth axes as well as permitting the telescope to slew automatically. The database within the Syn-Scan Go-To controller hosts over 42,900 objects that the telescope is then able to track freely and easily. The pointing accuracy comes out to up to 5 arc-minutes, and the inbuilt 'Freedom-Find' dual encoder design also allows you to manually adjust your telescope without losing the positional information set by your Go-To system.

The Zenith Eyepiece Height for this system is 79-inches. It gathers and captures 56-percent more light than a 16-inch telescope. The Mirror coatings are 94-percent Aluminum. The Secondary Diameter is 134 mm minor axis.


Major Component Weights:

  • Dobsonian Base: 66-pounds
  • Mirror Box: 70-pounds
  • Truss Poles: 2.6-pounds each, 16-pounds total
  • Upper Cage: 12-pounds
  • Counterweights: 2.3-pounds each, (3) 6.9-pounds total

When fully assembled without weights this item weighs 164-pounds.




Aperture508 mm (20")
Camera/Eyepiece Connection2" Nosepiece
Dawes Limit0.06 arcseconds
Focal Length2000 mm
Focal Ratiof/3.9
Free ShippingYes
Glass TypeBorosilicate
Hightest Magnification1016x
Light Gathering Power5267x
Limiting Magnitude17.3
Optical DesignDobsonian
Secondary Obstruction134mm
Tube Length2007mm
Tube Weight164 lbs


  • Sky-Watcher 20-Inch Stargate Dobsonian
  • Syn-Scan Go-To System
  • 2-Inch Dual Speed Crayford Focuser with 1.25-inch and 2-inch Extension Tubes
  • 2-Inch 28 mm LET Eyepiece
  • 2-Inch 10 mm Eyepiece
  • 9 x 50 Straight-Through Finderscope
  • Cast Metal Rocker and Base with Teflon Bearings
  • 3 Counterweights, 2.3-pounds each
  • Clamps and Shroud