Explore Scientific - 12" Truss Tube Dobsonian Telescope

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Regular Price: $1,799.99

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Explore Scientific's 12 inch, 305mm truss tube Dobsonian telescope is a high quality full aluminum telescope design for the ultimate in portability and light gathering power. Aperture at an affordable price! Lightweight design makes it easy to transport and set up. Includes a precision 2" focuser, red dot finder and built in cooling fans.

SKU: EXP-DOB1245-00
Manufactured by:
Explore Scientific

Product Description

Explore Scientific 12" Ultra-Light Truss Tube Dobsonian Telescope

From the industry leaders at Explore Scientific, a complete line of light weight Truss-tube Dobsonians in 10", 12", and 16" apertures. Truly revolutionary in their designs which combine light weight, ease of setup, superb optics, and ingenious means of portability, these awesome instruments are sure to please astronomers of all skill and experience levels.  For an option with a larger aperture and focal length, check out the 16-inch Explore Scientific Truss Tube Dobsonian.

For example, this 12" Truss-tube Dobsonian features 1525mm Focal length, f/5,  2" two-speed Crayford style focuser with 10:1 reduction, deluxe Red-dot finder, and two (2) large radial fans for fast thermal equilibrium.  Lightweight and portable the two-piece design allows the primary objective to store in a unique self contained aluminum housing and secondary fits inside the aluminum rocker box.

No telescope type has influenced amateur astronomy as radically as the Dobsonian telescope. Before the introduction of this telescope type by John Dobson the vast majority of amateur telescopes were small inadequate refractors on shaky mounts - just good enough to show the polar regions on mars or the rings of Saturn. Bigger telescopes, like the Schmidt-Cassegrain telescopes, were restricted to the relatively small group of amateurs that could afford them.The brilliant combination of simple - but effective - mechanics and the largest aperture available led to a worldwide triumph of Dobson's concept. No other telescope type offers you so much light for your money as a good truss tube Dobsonian. Despite its large aperture the 12-inch telescope can be transported easily even in small cars and is assembled within minutes without tools. The construction was optimized for maximum rigidity with a minimum of mass. The combination of BIG altitude wheels and a optimized aluminium-sandwich construction allows for small movements even at high magnifications. The focus position is already positioned to accept a coma-corrector. The ideal workhorse for the deep-sky enthusiast. A 12-inch telescope with a 305mm aperture gathers more than 1800 times more light than the naked eye. Details on planetary surfaces stand out even to inexperienced observers, and countless deep-sky objects show details. Bright globular clusters are resolved down to the core and the view of the lunar terminator will provide a unforgettable experience.


  • Modern 305mm ultra-light truss-tube dobsonian telescope in full aluminium construction
  • Modern secondary mechanics - the collimation is easily achieved without tools and keeps collimation well during transports
  • Modern primary mirror cell - the telescope mirror can be collimated from the front while looking through the eyepiece and is supported by a modern floatation system with radial roller bearings
  • Large altitude wheels provide smooth and precise movement even at high magnifications
  • Secondary unit and altitude wheels fit into the rocker box and the mirror box includes a cover for transport so that the whole telescope breaks down into only two aluminium cases and the trusses
  • Extremely high rigidity construction
  • Dew-resistant because of aluminium construction: no deforming press board due to the exclusive use of metals
  • Lightweight: the aluminium profile/aluminium plate construction reduces the weight to about half of the mass of most press board designs of this price range


Name Explore Scientific - 12" Truss Tube Dobsonian Telescope
Manufacturer Explore Scientific
Model EXP-DOB1245-00
UPC 812257015573
Manufacturer Part # EXP-DOB1245-00
In The Box Explore Scientific 12" Dobsonian Telescope Red Dot Finder 2" Focuser Collimation Tool
Angular Field of View 0.43 arc seconds
Aperture 305mm (12")
Fans Dual
Finderscope Deluxe Red Dot Finder
Focal Length 1525mm
Focuser Crayford type w/ 10:1 reduction
Highest Useful Magnification 600X
Mount Dobsonian
Objective 305mm
Optical Tube Aluminum
Primary Mirror 305mm
Resolution 0.43 arc seconds
Secondary Mirror 73mm
Secondary Obstruction (%) 24
Warranty Explore Scientific STAR Lifetime Warranty (click to read more)


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In the Box

Explore Scientific 12" Dobsonian Telescope
Red Dot Finder
2" Focuser
Collimation Tool