Sky-Watcher Stargate 450P SynScan 18" GoTo Truss Dobsonian

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$6,999.00

Availability: In stock

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

Our Product #: S11920
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 18" 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 18" 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 18" gathers 500% 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 66 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 74.5" when pointing at the zenith. 
Optical Design

Dobsonian

Primary Aperture (mm)

458mm (18”)

Secondary Diameter (mm)

120mm minor axis

Secondary Obstruction by Area

7%

Mirror Coatings

94% Aluminum

Glass Type

Borosilicate

Focal Length (mm)

1900mm

Focal Ratio

4.1

Light Gathering (compared to next size down)

Captures 27% more light than a 16” telescope

Zenith Eyepiece Height

74.5”

Rayleigh Limit

0.31

Dawes Limit

0.25

Limiting Magnitude

15.9

Minimum Magnification

65x

Maximum Magnification

902x

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

11lbs.

Truss Pole Weight

2.6lbs each. 16lbs total

Mirror Box Weight

62lbs.

Dobsonian Base Weight

66lbs.

Fully Assembled Weight (with weights)

155lbs.

Tech Details

Aperture 18'
Focal Length 1900mm
Focal Ratio f/4.1
Heaviest Single Component 66 pounds
Highest Useful Magnification 902x
Motorized Controls Computerized GoTo
Weight 155 pounds
Optical Coatings 94% reflectivity
Supplied Eyepiece 28mm LET eyepiece and 10mm eyepiece
Telescope Type Reflector
View Finder 9x50
Visual Limiting Magnitude 15.9

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