Sky-Watcher - 20" Stargate Truss Dobsonian

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SkyWatcher Stargate Dobsonians feature a truss tube design making these large aperture telescopes lightweight and easy to transport. Truss come in two sections further reducing their length for portability. This 20” Dobsonian features 94% reflectivity mirror coatings, very fast f/3.9 optics and a dual speed focuser.
SKU: SKW-S11910
Manufactured by:
Sky-Watcher USA
 

Product Description

Sky-Watcher - 20" Stargate Truss Dobsonian

SkyWatcher Stargate Dobsonians feature a truss tube design making these large aperture telescopes lightweight and easy to transport. Truss come in two sections further reducing their length for portability. This 20” Dobsonian features 94% reflectivity mirror coatings, very fast f/3.9 optics and a dual speed focuser.
  • This Telscope has Fused conical primary mirror
  • Cellular secondary mirror
  • Dual speed 2” Crayford focuser
  • Two section truss poles (compact transport)
  • Minimalist, all metal construction
  • Fast f/3.95 optics for short eyepiece heights
  • 20” provides 56% more light than a 16” telescope
  • 94% reflectivity coatings

Optical Design

Dobsonian

Primary Aperture (mm)

508mm (20”)

Secondary Diameter (mm)

134mm minor axis

Secondary Obstruction by Area

7%

Mirror Coatings

94% Aluminum

Glass Type

Borosilicate

Focal Length (mm)

2000mm

Focal Ratio

3.95

Light Gathering (compared to next size down)

Captures 56% more light than a 16” telescope

Zenith Eyepiece Height

79”

Rayleigh Limit

0.28

Dawes Limit

0.23

Limiting Magnitude

16

Minimum Magnification

72x

Maximum Magnification

1000x

GoTo

Yes

Object Database

42900+

Dual Encoders

Yes

Focuser

2″ Dual Speed Crayford

Included Eyepieces

28mm LET eyepiece and 10mm eyepiece

Included Finder

9×50

Other Included Items

2.3lbs counter weights (3), Shroud, Truss clamps

Upper Cage Weight

12lbs.

Truss Pole Weight

2.6lbs each. 16lbs total

Mirror Box Weight

70lbs.

Dobsonian Base Weight

66lbs.

Fully Assembled Weight (with weights)

164lbs.

Specifications

Name Sky-Watcher - 20" Stargate Truss Dobsonian
Manufacturer Sky-Watcher USA
Model SKW-S11910
In The Box 20” Dobsonian with Truss Tube Supports Dobsonian Cradle Base 2” Crayford Dual Speed Focuser 10mm LET Eyepiece 28mm LET Eyepiece
Aperture 508mm (20”)
Eyepieces 28mm LET eyepiece and 10mm eyepiece
Finderscope 9×50
Focal Length 2000mm
Focal Ratio 3.95
Focuser 2″ Dual Speed Crayford
Highest Useful Magnification 1000x
Included Accessories 2.3lbs counter weights (3), Shroud, Truss clamps
Light Gathering Power Captures 56% more light than a 16” telescope
Limiting Stellar Magnitude 16
Lowest Useful Magnification 72x
Secondary Mirror Obstruction by Area 7%

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In the Box

20” Dobsonian with Truss Tube Supports
Dobsonian Cradle Base
2” Crayford Dual Speed Focuser
10mm LET Eyepiece
28mm LET Eyepiece