Orion SkyQuest XX16G Go-To Truss Tube Dobsonian Telescope

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Orion SkyQuest XX16G Go-To Truss Tube Dobsonian Telescope
Item # OR-8968
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  • The Orion SkyQuest XX16G Dobsonian Telescope presents a perfect combination of big-aperture optics and sophisticated, fully motorized object location technology for the ultimate in Dobsonian telescope performance and observing convenience.
  • Both the optical tube and Dobsonian base can be broken down quickly without tools into easily manageable components for convenient transport in any standard size car.
  • The Orion SkyQuest XX16G Dobsonian Telescope features accurate, motorized GoTo pointing and tracking of over 42,000 celestial objects within its GoTo system database, and enough aperture for great views of each one.
  • Closed-loop electronics forgive accidental bumps and allow the telescope to be moved manually without losing alignment of the GoTo system.
  • Heavy-duty clutches on both axes allow independent adjustment of motion to desired level of resistance.
  • Huge 16" (406mm) diameter, convex-back parabolic primary mirror with enhanced, 94% reflectivity aluminum coating delivers outstanding views of faint deep-sky objects.


Orion SkyQuest XX16G Go-To Truss Tube Dobsonian Telescope

Orion's largest Dobsonian reflector yet is an ideal combination of three key telescope features: large aperture, convenient portability, and precise GoTo object location. Thanks to its 16" aperture parabolic primary mirror, the Orion SkyQuest XX16g GoTo Truss Tube Dobsonian will astound you with spectacular views of the night sky. Its Orion-designed collapsible Dobsonian base and 8-pole truss optical tube makes transportation of this hefty telescope easy since the entire telescope can be disassembled without tools into small, manageable component pieces that can fit in virtually any standard size car. You'll be able to enjoy the XX16g's large-aperture optics thanks to the accurate, motorized GoTo system which will automatically locate and track any of over 42,000 celestial curiosities within its computerized database of night sky objects.

The powerful, high-tech, and downright big Orion SkyQuest XX16g 16" GoTo Truss Tube Dobsonian takes deep-sky observing to new space-penetrating depths. It is the latest and largest in our line of fully automatic GoTo truss tube Dobsonians. For serious amateur astronomers seeking big-aperture exhilaration, state-of-the-art GoTo electronics, and a clever Dobsonian design that is transportable in almost any size vehicle -- the Orion XX16g is an ideal "lifetime" telescope!

Wait, you're thinking, it fits in almost any size vehicle? Yes, you can take this big telescope with you, because both the Dobsonian base and optical tube of the Orion XX16g were engineered by Orion to quickly disassemble - without tools - into easily manageable components, the heaviest of which (base groundplate assembly) weighs 61.4 lbs.

Both the 16"-diameter (406mm), lightweight parabolic primary mirror and 91mm minor-axis secondary mirror of the SkyQuest XX16g are made of low-expansion glass and feature enhanced 94% reflectivity aluminum coatings for optimal observing performance. The Orion XX16g delivers a giant 77% jump in light grasp compared to a 12" Dobsonian reflector, and even a sizeable 30% gain over a 14" aperture telescope! Those elusive celestial objects you once considered "faint fuzzies" won't be nearly so faint or so fuzzy through the SkyQuest XX16g GoTo Truss Tube Dobsonian! You'll enjoy views that simply cannot be seen in smaller telescopes.

The lightweight primary mirror cools more efficiently than standard flat-back parabolic mirrors, thanks to its thin, curved-back design. The primary mirror is held in place by an open-ventilation mirror cell which also helps the mirror to acclimate quickly. This special mirror cell features three large knurled knobs for easy collimation adjustments.

While the Orion XX16g is easy to disassemble for convenient portability, once it's assembled it is a very solid telescope. The rigid 8-pole truss tube provides great structural rigidity of the optical tube and virtually eliminates flexure that can affect 6- and 3-pole designs. The XX16g GoTo Dobsonian base utilizes thick, 1" composite wood panels for extra-strong support, and features perpendicular struts that brace the side panels when assembled for rock-solid performance. All base boards are laminated with water-resistant melamine.

The Orion XX16g's SynScan GoTo system includes a database of over 42,000 celestial objects. Dual optical encoders and servo motors in each axis pinpoint any object you select with the backlit hand controller and track its motion. The closed-loop electronics let you slew the telescope by hand if desired, while still maintaining the GoTo alignment. Heavy-duty clutch knobs on both axes can be adjusted to the desired level of resistance.

If you were to point the Orion XX16g Dobsonian optical tube straight up, the telescope eyepiece would be positioned 72-3/8" (6.03') above the ground. Of course, during most observing sessions the eyepiece will be considerably lower than this maximum height, but no matter where you point the Orion XX16g at night, you're sure to be astonished by the bright, sharply detailed views this amazing telescope provides.

The Orion SkyQuest XX16g comes equipped with a 2" dual-speed Crayford focuser with 1.25" adapter, and includes a 28mm 2" DeepView eyepiece and a 12.5mm illuminated reticle eyepiece for precise GoTo system alignment. Other accessories include an EZ Finder II reflex sight, eyepiece rack, GoTo hand controller bracket, 12V DC power cable, and RS-232 cable for firmware updates. A 12V field battery or AC-to-DC adapter (sold separately) is required for motorized operation.

An optional Light Shroud for the optical tube is also available and highly recommended Light Shroud (sold separately). Keep your XX16g optical tube safe and clean during transport or storage with the recommended optional Case Set (sold separately). It's a big telescope you can take anywhere! Get the Orion SkyQuest XX16g and enjoy jaw-dropping views of the night sky in a big yet pleasantly portable GoTo Dobsonian telescope.

Orion SkyQuest XX16G Go-To Truss Tube Dobsonian Telescope Specifications


  • Best for viewing: Fainter deep sky
  • Best for imaging: Lunar & planetary
  • User level: Advanced
  • Optical design: Reflector
  • Optical diameter: 406mm
  • Focal length: 1800mm
  • Focal ratio: f/4.4
  • Optics type: Parabolic
  • Glass material: Low thermal expansion glass
  • Eyepieces: 28mm DeepView, 12.5mm Illuminated Plossl
  • Magnification with included eyepieces: 64x, 144x
  • Resolving power: 0.29 arc*sec
  • Lowest useful magnification: 58x
  • Highest useful magnification: 800x
  • Limiting stellar magnitude: 16.5
  • Optical quality: Diffraction limited
  • Finderscope: EZ Finder II
  • Focuser: 2" Dual-Speed Crayford
  • Secondary mirror obstruction: 91mm
  • Mirror coatings/over-coatings: Enhanced Aluminum & Silicon Dioxide
  • Mount type: Dobsonian
  • Astro-imaging: Simple moon shots
  • Computerized compatibility: Go-To included
  • Alignment procedure: 2-Star alignment
  • Number of objects in database: 42,000+
  • Bearing material: AZ: Thrust needle bearings ALT: Ball bearings
  • Power requirement: 12-volt DC (tip positive)
  • Setting circles: Electronic, via the hand controller
  • Available ports: RS-232
  • Tube material: Steel
  • Tripod material: Wood
  • Optical tube weight: 89.8 lbs.
  • Mount/tripod weight: 105 lbs.
  • Weight, fully assembled: 195 lbs.
  • Other features: Closed loop servo drive GoTo system, Collapsible base for convenient transportation, Choose from auto tracking or GoTo mode.
  • Warranty: One year


 When using a truss tube Dobsonian telescope for solar observing, always use a Light Shroud and a properly sized solar filter. When you install the Light Shroud make certain there are no gaps between the Shroud and the telescope where direct sunlight can reach the mirror.

When a truss tube telescope (equipped with a solar fi lter but no shroud) is pointing near (not at) the Sun, direct sunlight can hit the mirror and focus on the solar fi lter or other portions of the telescope. Th is can lead to eye injury or damage to the telescope. Using a Light Shroud protects your telescope from peripheral sunlight.

Before using any telescope for solar observing, make sure to install dustcaps or other protective covers on all optical components such as fi nder scopes to keep sunlight from passing through them. Glancing through an uncovered optical system even for an instant can cause permanent eye damage.

Always install protective caps on all optical instruments when left outside in direct sunlight during daylight hours.

OPT Product Number: 8968

Additional Information

Additional Information

SKU OR-8968
Manufacturer Orion
Telescope Series Orion SkyQuest
Optical Design Newtonian Reflector - Open Truss
Mount Type Dobsonian Cradle with GoTo
Warranty 1 Year Warranty
Telescope Aperture 16"
Telescope Focal Length 1800mm
Telescope Focal Ratio f/4.4
Highest Useful Magnification 800x
Limiting Stellar Magnitude 16.5
OTA Mount Type Dobsonian Cradle
Optical Tube Outer Diameter 406mm
Optical Tube Weight 89.8 lbs.
Mount Weight 105 lbs.
Total Telescope Weight 195 lbs.
Objects in Database 42,000+
Alignment Procedure 2-Star Alignment
CD ROMs Included None
Eyepiece(s) Included 28mm DeepView, 12.5mm Illuminated Plossl
Diagonal Included? No - Not Required
Power Adapter Included None - Requires 12V DC Adapter
Counterweights Included (9) 2.2 lb.
Finder Included Red Dot Finder
Included Items

Included Items

  • Orion XX16g Optical Tube Bottom Section
  • Orion XX16g Optical Tube Top Section
  • Truss Poles
  • GoTo Base
  • (2) Carrying Handles for Base
  • SynScan Hand Controller and Cables
  • Assembly Hardware
  • 16" Parabolic Primary Mirror and Support Cell
  • 28mm DeepView Eyepiece - 2"
  • 12.5mm Illuminated Plossl Eyepiece
  • Eyepiece Rack
  • EZ Finder II Finder Scope
  • Extension Tube - 2"
  • (9) 2.2-lb. Counterweights
  • Collimation Cap
  • Hand Controller Mounting Bracket
  • (2) Dust Covers
  • 12V DC Power Cable
  • RS-232 Serial Cable
  • Set of Hex Keys
Questions & Answers

Product Questions

Synscan "V4" hand controller?
Can I store this scope in a resin outdoor storage shed for years together? The base is having wood. I live in Phoenix, AZ and so the summers are extremely hot than winters. I don't want the wood to start going bad after I keep it in a storage shed out in my backyard.
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