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Sky-Watcher Flextube 12" Dobsonian Telescope

Condition: Brand New in Original Packaging

SKU: S11740



  • Ability to tackle elusive deep-space gems
  • Easy to find your target
  • High performance Teflon bearing system
  • Smooth vertical and horizontal manual movement
  • No need for constant mechanical adjustment
  • Quality components throughout
  • Properly corrected optics
  • Rigid construction and outstanding stability

Product Description

Backyard astronomers, rejoice! The Celestron 12-Inch Sky-Watcher Dobsonian Telescope will make you the hit of every star party. This serious telescope is perfect for sidewalk star-gazers who want to tackle deep-space gems. The superior horsepower of the Dobsonian makes objects appear brighter and reveal their essential structure more prominently. It’s also easy to swing from one side of the sky to the other, thanks to a high performance Teflon bearing system in both axes. In fact, Celestron offers superior mechanical and structural components like a highly polished diagonal mirror for good contrast, and corrected optics for minimum alterations to the optical wave-front. Take your viewing to the next level with a Sky-watcher Dobsonian Telescope.

Excellent Viewing

Everything in deep-space appears brighter, and wider in extension with the SW 12" DOB. Many of the more challenging-to-resolve objects in smaller diameter telescopes will now reveal their essential structure. Objects just within the threshold of a 10" aperture will now appear more prominent, and may even be worth dwelling upon for extended periods. Comet hunters will delight in the fainter magnitudes that are possible to discern in the SW 12" DOB.

Here at last is a telescope within the threshold to tackle elusive deep-space gems like the Horsehead Nebula in Constellation Orion. Located in Constellation Perseus, M76, is a very faint nebula of 11th magnitude. The SW 12" will capture this baby like you want to see it. M97, a planetary nebula in Ursa Major is very faint, but as a serious amateur you will want to see it!


Observing with a Dobsonian has been described akin to shooting ducks in a gallery because it is so easy to find your target. Just swing your SW DOB to the quadrant of sky to be searched, and scan the vicinity. An 8x50mm Right Angle optical viewfinder provides both magnification and light-gathering to help narrow your search for those elusive fuzzies. The standard-equipment backlash-free 2" Crayford Focuser insures ultra smooth focusing adjustments. Multi-coated, 4-element eyepieces (25mm and 10mm) provide a spacious 52° Apparent Field of View.

To ensure mechanical ease-of-use, SW uses a high performance Teflon bearing system in both axes combined with tension adjustment in altitude to set the appropriate amount of friction, assuring smooth vertical and horizontal manual movement. This also eliminates the need to have a balanced optical tube as in an equatorial mount. Sky-Watcher's Teflon bearing system is preferable to the use of ball-bearings. Ball-bearings make unintended movement of the optical tube more difficult to control. Fortunately, at low power, deep-space objects leisurely drift through the field of the SW 12" DOB, so constant mechanical adjustment of the telescope's orientation isn't needed to keep objects in the field of view.

Quality Components

The Sky-Watcher 12" DOB utilizes quality components throughout. Workmanship pride manifests itself in high quality standards of optical and mechanical fabrication. The polishing process for primary and diagonal mirror yields smooth mirror surfaces ensuring good contrast, and properly corrected optics show minimum alterations to the optical wave-front.

On each primary mirror, and elliptical diagonal mirror aluminum is vacuum deposited to the front glass surface and then over coated with hard quartz (SiO4). Additional layers of Titanium Dioxide (TiO2) and (SiO4) are then applied.

The mechanical and structural components of the OTA exhibit rigid construction and outstanding stability. The mount construction is sturdy and rigid. Mount design, while simple, facilitates smooth motions about both axes.

What's in the Box

  • Sky-Watcher Flextube 12" Dobsonian Telescope
    • 12" (305 Mm) Dobsonian-Style Newtonian
      • 2" Crayford-Style Focuser with 1.25" Adapter
      • 4-Element Plössl 25 mm And 10 mm 1.25" Eyepieces
      • 8x50 Right Angle Erect-Image Finderscope
    • Solid Rocker-Mount with Tension Clutch
      • Aluminum Plate with Needle Bearings
  • Two Year Warranty


  • Optical Design: Dobsonian
  • Primary Aperture (mm): 305mm (12")
  • Focal Ratio: 4.9
  • Focal Length (mm): 1500mm
  • Secondary Diameter (mm): 70mm
  • Secondary Obstruction by Area: 5%
  • Mirror Coatings: 94% Aluminum
  • Glass Type: Borosilicate
  • Included Finder: 8x50 Right Angle Correct Image
  • Included Eyepieces: 25mm and 10mm 1.25" Super Plossls
  • Magnification with Included Eyepieces: 60x (25mm), 150x (10mm)
  • Other Included Items: 1.25" and 2" eyepiece adapters
  • Focuser: 2" Crayford
  • GoTo: No
  • OTA Weight (with accessories): 46.2 lbs
  • OTA Length: Retracted: 36" Extended: 55"
  • Zenith Eyepiece Height: 55.5"
  • OTA Outer Diameter: 14.25"
  • Dobsonian Base Weight: 38.3 lbs
  • Base Size:
    • Height: 25"
    • Width: 29"
  • Dawes Limit: 0.38
  • Rayleigh Limit: 0.46
  • Limiting Magnitude: 14.9
  • Light Gathering (compared to next size down): 44% (compared to 10")
  • Minimum Magnification: 43x
  • Maximum Magnification: 600x





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