Sky-Watcher Stargate 450P 18″ Truss Dobsonian
| Article number: | S11900 |
| Availability: | More on the Way to us |
| Delivery time: | More on the Way to Us |
- 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
Our superior optics just got better
Stargates 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.
Solid foundations, easy assembly
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.
Synscan puts the universe in your hands
Our GoTo line of Stargates provide motorized operation in both alt 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 the on-board database.
Sky-Watcher’s Freedom Find™ dual-encoder technology ensures accurate tracking while allowing 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.
| 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 |
No |
| 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 |
40lbs. |
| Fully Assembled Weight (with weights) |
129lbs. |
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