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telescopes

Sky-Watcher 18" Stargate 450P SynScan Truss Tube GoTo Dobsonian - S11920

Sky-Watcher USA   ——   SKU: SWU-S11920
old price $9,169.00 – 7% savings
$8,514.00 CAD
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Sky-Watcher 18" Stargate 450P SynScan
Truss Tube GoTo Dobsonian

  • Fused conical primary mirror
  • Cellular secondary mirror
  • Dual speed 2” Crayford focuser
  • Two section truss poles (compact transport)
  • Minimalist, all metal construction
  • Fast f/4.1 optics for short eyepiece heights
  • 18” provides 27% more light than a 16” telescope
  • 94% reflectivity coatings
  • Superior quality optical elements
  • Freedom Find, dual encoders
  • SynScan System with 42,000+ object database

Sky-Watcher USA's superior optics just got better - the 18" Stargate 450P SynScan Truss Tube GoTo Dobsonian telescope features Sky-Watcher’s exclusive fused conical parabolic mirror. The fused design allows for thinner mirror construction that provides faster cooling and lighter weight. This is a breakthrough in Dobsonian-Newtonian telescope fabrication technique. The thinner precision parabolic mirror is supported by fused conical radial struts, thus providing the solid stability you require but greatly reducing the thickness and weight of the primary mirror. Faster cooling of the primary means you get to do serious observing earlier in the evening and for a longer time.

Combined with the cast cellular secondary mirror and Sky-Watcher’s exclusive 94% reflectivity coatings, the 18" Stargate 450P SynScan Truss Tube GoTo Dobsonian telescope delivers bright, detailed views of your favorite deep sky objects. The 20 inch (a full half meter of aperture) boasts a monster 27% more light gathering power than the S-W 16" scope.

Sky-Watcher uses a high-performance Teflon and steel bearing system in both axes combined with tension adjustment in altitude to facilitate setting the appropriate amount of friction, assuring smooth vertical and horizontal manual movements. Setting up this large Dobsonian scope is very simple and quick, and transporting it to your favorite site is also easy because it can be broken down into very manageable parts. See one of the photos for an illustration. For example, the primary mirror box weighs 62 pounds and the upper cage weighs only 11 pounds, while the Dobsonian base weighs only 40 lb.

With the SynScan GoTo system from Sky-Watcher, you now can have the Universe at your finger tips! The Sky-Watcher GoTo line of Stargate telescopes provides motorized operation in both altitude and azimuth axes. Featuring Sky-Watcher’s proprietary SynScan hand controller, your scope now automatically slews to and tracks over 42,900 celestial objects from its on-board database. The amazing SynScan GoTo system from Sky-Watcher incorporates both encoders and motors which enable the Dobsonian mounting to become a tracking GoTo telescope mount. This feature is a major advancement in Dobsonian scope technology.

Sky-Watcher’s Freedom Find™ dual-encoder technology ensures accurate tracking while at the same time, it allows you to move the telescope manually in either axis without compromising alignment. This provides a level of convenience and flexibility not available in telescopes without dual encoders.

Imagine the convenience of assembling your 18" Stargate 450P SynScan Truss Tube GoTo Dobsonian telescope in only a few minutes at your favorite dark observing site, and then having a fully functional GoTo and tracking system available for your celestial exploration with all the convenience of a conventional Dobsonian mounting at the same time.

Setting up a Stargate is a simple procedure, taking only about 20 minutes! Spring loaded truss anchor points are clearly labeled to eliminate any frustration or confusion. The truss tubes are each disassembled into 36" long pieces which are easy to manage and transport. Adjustable feet make leveling a snap.

Sky-Watcher's Teflon bearing system is preferable to the use of ball-bearings. Ball-bearings make unintended movement of the optical tube more difficult to control. The minimalist all-metal structure of the Sky-Watcher 18" Stargate 450P SynScan Truss Tube GoTo Dobsonian produces a sturdy and stable platform while maintaining a convenient and compact footprint. The truss-tubes break down to a very manageable 36 inch length. Azimuth and altitude bearings are steel and Teflon for smooth, steady movement. With the heaviest component being the primary mirror box, weighing 62 pounds, two persons can easily carry this part without back strain, and often one person who is physically fit may be able to carry the mirror box alone.

Specifications:

SKU: S11900
UPC: -not given-
Optical Info:
Optical Design: Newtonian
Mirror Coatings: 94% Aluminum
Glass Type: Borosilicate
Primary Aperture (mm): 458
F/Ratio: 4.14
Focal Length (mm): 1900 mm
Secondary Diameter: 120 mm
Secondary Obstruction (by diameter): 26%
Secondary Obstruction by Area: 7%
Dawes Limit: 0.25 arcsecond
Rayleigh Limit: 0.31 arcsecond
Limiting Mag: 15.9
Minimum Magnification: 65x
Maximum Magnification: 902x
Light Gathering (compared to next size down): 27%
GoTo Operation: Yes
Dual Encoders: Yes
Object Database: 42,900+
Focuser: 2" Dual-Speed Crayford Type
Upper Cage Weight: 11 lb
Truss Pole Weight: 2.6 lb, each, 16 lb total
Mirror Box Weight: 62 lb
Dob Base Weight: 66 lb
Full Assembled Weight: 155 lb, with weights
Zenith Eyepiece Height: 74.5"
Included Finder: 9 x 50
Included Diagonal: None
Included Eyepieces: 28 mm / 10 mm/ Collimating
Magnification w/ Included Eyepieces: 68x/190x
Case: None
Corrector: None
Other Accessories: 3 ea 2.3 lb counterweight, Protective Shroud, Truss Clamps
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