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Explore Scientific 12" Ultra Light Dobsonian 305mm

Explore Scientific 12" Ultra Light Dobsonian 305mm
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Explore Scientific 12" Ultra Light Dobsonian 305mm
Ex Tax: £940.83
  • Stock: Ask About Stock
  • Model: ES-0116930
  • Shipping Weight: 36.00kg
  • SKU: ES-0116930
  • GTIN: 4007922004556
  • MPN: ES-0116930


Modern 12" - 305mm Truss-Dobsonian telescope in full aluminium construction  with diffraction limited optics (Strehl 0.8)


  • 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
  • Two large radial fans for fast thermal equilibrium

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 this concept. No other telescope type offers you so much light for your money as a good Dobson. We have taken the motto "held together by gravity and driven by yoghurt power" and offer a modern version of the classic - designed by amateur astronomers for amateur astronomers. Despite its large aperture the 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 our coma-corrector. The ideal workhorse for the deep-sky enthusiast. This 12" telescope with 305mm aperture gathers more than 1800-times more light than the naked eye. Details on planetary surfaces stand out even to unexperienced 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.

Optical design
12" Newtonian Reflector
Mount Type
Objective diameter (mm)
Focal length (mm)
Maximum recommended magnification
Aperture ratio
very good
Mount type
Focusing system
2" Rack-and-Pinion Focuser with helical gearing and 10:1 reduction
Warranty (Years)
Eyepiece Barrel Diameter (mm)
Angular resolution (arc seconds)
Material OTA
Field of application
Deep Sky Observation
Lunar observation
Planetary observation
Rain/Dust protection caps
Dust protection caps for open aperture and eyepiece holder
Primary mirror diameter (mm)
Obstruction (%)
Secondary mirror diameter (mm)
Focus Group
Visual enthusiasts
Advanced Amateurs
DeLuxe Red Dot Finder
Net Weight total (incl. accessories) (kg)

Dimensions for mobile use of the 12" Explore Scientific Ultra Portable Dobsonian
Rockerbox 450x450x320mm
Mirrorbox 380x380x300mm
Trusses approx. 980mm
Eyepiece Height while pointing at zenith approximately 1.4m

Net total weight: 32.1 kg
Mirror Box: 18.9 kg
Secondary cage +Rockerbox: 10 kg
4 Pairs of trusses: 1.8kg
Altitude Wheels: 1.4kg


General Information
Weight in Kg36

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