Sky-Watcher SKU: S11900 | Helix SKU: CTS11900
Stargate's feature Sky-Watcher’s exclusive fused conical parabolic mirrors. The fused design allows for thinner mirror construction that provides faster cooling and lighter weight.
Combined with the cast cellular secondary mirror and Sky-Watcher’s exclusive 94% reflectivity coatings, Stargate delivers bright, detailed views of your favorite deep sky objects. The 18 inch model captures 27% more light than our 16 inch, while the 20 inch (a full half meter of aperture) boasts a monster 56% more light gathering power.
The minimalist all-metal structure of the Stargate 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 for easy transport. Azimuth and altitude bearings are steel and Teflon for smooth, steady movement.
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. Adjustable feet make leveling a snap.
|Mirror Coatings||94% Aluminum|
|Primary Aperture (mm)||458|
|Focal Length (mm)||1900|
|Secondary Obstruction (by diameter)||26%|
|Secondary Obstruction by Area||7%|
|Light Gathering (compared to next size down)||27%|
|Focuser||2" Dual Speed Crayford|
|Zenith Eyepiece Height||74.5"|
|OTA Length (Retract/Ext.)||78.75"|
|OTA Outer Diameter||20.5"|
|Dob Base Weight||40 lbs|
|Upper Cage Weight||11 lbs|
|Truss Pole Weight||2.6 lbs each. 16 lbs total|
|Mirror Box Weight||62 lbs|
|Full Assembled Weight (with weights)||129 lbs|
|Included Finder||9x50 Finder|
|Included Eyepieces||28 LET/10mm/Coll.|
|Magnification w/ Included Eyepieces||68x/190x|
|Other Included Accessories||2.3lbs counter weights (3), Shroud, Truss clamps|