• -$6,000.00

(USED) 18" SkyWatcher Stargate Truss Dobsonian

$2,150.00 Save $6,000.00

This is a prototype telescope that was used for trade shows in North America by Skywatcher 

Special Ultralight Sandwich mirror made possible by Hubble Optics.

Dual speed Feather Touch 2.5" Focuser worth 680.00 alone! 

8x50 Finderscope

Smooth motions throughout.

Product Features

Sky-Watcher brings to you the ultimate DOB experience with the StarGate 18 Dobsonian!  Given its remarkable light gathering power, you will be able to catch the most subtle night sky features with your naked eyes. The sturdy giant is reasonably light (110Lb) despite its dimensions, and being easily assembled (30-minute setup time), the whole scope boasts remarkable transportability. If you have the appetite for exceptional planetary and deep space observation, then don't miss out on this high-quality Newtonian system. 


Features High-Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal length reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, contrasty images, which are full of detail.


Most reflectors today usually have a coat of aluminum as the mirror surface and then an overcoat of silicon monoxide or silicon dioxide to protect it. Silicon dioxide produces a much more durable coat than silicon monoxide but requires specialized equipment to apply it and is, therefore, more expensive. Protection is needed, because, in most reflectors, the mirror is open to the elements and deterioration of the reflective layer reduces the resolution of the telescope. ALL Sky-Watcher reflectors are Multi-Coated with Silicon Dioxide as a standard for Optimum Durability and Long Term Performance.

Newtonian Reflector

Aperture: 458 mm (18'')

Focal Length: 1900 mm (74.8 in)

Focal Ratio: f4

Central Obstruction: 120 mm, 26% 

Light Gathering Power: 4266x

High quality/precision parabolic mirror

Low-expansion borosilicate glass for both primary mirror & secondary mirror

For visual observing up to 914x practical magnification (Lowest Useful magnification 65x)

0.25-arc second resolving power (Dawes) and 0.28 arc seconds resolving power  (Rayleigh) & 16 stellar magnitude

Portable, quick-assemble truss structure

Fully Illuminated Field: 44 mm (1.7 in)

Optical Tube Length: 1940 mm (76.4 in)



Optical Design Newtonian Reflector 

Optical Diameter 458 mm (18 in) 

Focal Length 1900 mm (74.8 in) 


Highest Practical Power 914 x 

Finder Scope 8x50 finder scope 

Focuser Diameter 2" crayford dual-speed 

Eyepieces LET 2"-28; SPL10 

Shipping Weight 31kgs;10kgs;27kgs;23kgs 

Shipping Dimensions 79x76x36cm3;71x70x44cm3;81x75x28cm3;107x50x28cm3