Sky-Watcher Stargate 500P SynScan 20" GoTo Truss Dobsonian

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The Sky-Watcher Stargate dobsonians will allow you to see things that you never thought possible.

Our Product #: S11930
Sky-Watcher Product #: S11930
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Product Description

If you want to observed Deep Space objects, this should be the scope for you.  The 20" primary mirror is a light gathering tour de force.  Throw in a computer driven SynScan GoTo system and you have a truly portable observatory.  The 20" Stargate GoTo Truss Tube Dobsonian will start to bring in all those hard to find objects in the sky and even introduce some whisps of color.  Looking through a truly large telescope is like seeing the sky for the first time.
If you are an average astronomer, then you more than likely use an 8" scope of some sort.  Well, the 20" gathers 625% more light taking your observation to another level.  Now there is a trade-off for all this size, and that is the weight of the instrument.  As with all truss dobsonians, the telescope breaks down for ease transportation.  Be forewarned, you will still have to lug around a few pieces with the heaviest weighing in at 70 pounds.  Once you get it all moved and assembled the StarGate uses Sky-Watcher's feature rich SynScan computer system to get you around the night sky.  The 42,900 objects should keep you busy pretty much forever.  If you see something in the sky and you don't want to wait to find it in the computer Sky-Watcher has your back.  The Stargate's come wth Freedom Find dual-encoders that ensures accurate tracking while allowing you to move the scope manually without messing up your computer alignment.
The fused conical parabolic mirrors allow for a lighter mirror that will cool faster getting you oberving more quickly while saving your back.  Once you get your scope all set up you will notice the eyepiece is not too far off the ground as it sits right at 79" when pointing at the zenith. 
Computerized GoTo
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
Freedom Find, dual encoders
SynScan with 42,000+ object database
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: f/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
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.

Tech Details

Aperture 20"
Focal Length 2000mm
Focal Ratio f/3.95
Heaviest Single Component 70 lbs
Highest Useful Magnification 1000x
Motorized Controls Computer GoTo
Weight 164 pounds
Optical Coatings 94% reflective
Supplied Eyepiece 28mm LET eyepiece and 10mm eyepiece
Telescope Type Reflector
View Finder 9x50
Visual Limiting Magnitude 16


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