12" Flextube 300P Collapsible Dobsonian

SKU: S11740

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  • Regular price $1,715.00

DROP SHIPPED: This is a special order product shipped directly from the manufacturer.
Drop shipped products are not returnable and require additional order processing time.

$79 Economy shipping for Dobsonian Telescopes Due to their size and bulk, we are not able to offer free shipping on Dobsonian Telescopes, but offer a steep discount off the actual cost.

Not Returnable Please note that due to this product's size and shipping costs, this product is not returnable.

Note: No Longer Stocked, but available for drop ship.

  • 12″ (305 mm) Dobsonian-style Newtonian
  • 1500 mm focal length (f/5)
  • 2″ Crayford-style focuser with 1.25″ adapter
  • 4-element Plössl 25 mm and 10 mm 1.25″ eyepieces
  • 8×50 right angle erect-image finderscope
  • Solid rocker-mount with Teflon bearings and tension clutch for altitude
  • Aluminum plate with needle bearings for azimuth
  • Eyepiece height at zenith: 55.5”

Sky-Watcher 12″ DOB: Deep-Space Hero!

The Sky-Watcher 12″ DOB is a big gun. If you are shooting for well resolved, elusive 12th-magnitude fuzzies, you now have the power. In fact, a very significant wow-factor extends down to viewing the stuff people usually concentrate on with 8″ and 10″ telescopes. Except they say, “WOW!”, when they view through this super aperture amateur 12″ SW telescope. You can not only be a hero to yourself, but a mystical guru to other backyard astronomers, scout groups, friends, and neighbors. Astronomy is a great hobby to share, and a SW 12″ DOB makes you potentially the hit of any star party. Well, so much for ego satisfaction—the point is—the SW 12″ DOB is a serious telescope that will be purchased by a serious amateur who wants serious deep-sky penetrating resolution. Be advised this Light Chariot is one sweet astronomical ride!

Viewing Through the SW 12″ DOB

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 now reveal their essential structure. Objects just within the threshold of a 10″ aperture now appear more prominent and may 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. No worries, the SW 12″ DOB will fulfill your quest. M61, a spiral galaxy in Constellation Virgo, will reveal spiral arms as you would hope to see them, but you will need a SW 12″ telescope to resolve them well. The list goes on, and you will delight in planning your own journey of exploration.

The 12″ Sky-Watcher Establishes a New Standard in Large Aperture Ease-of-Use

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 when star-hopping. The standard-equipment backlash-free 2″ Crayford Focuser insures ultra smooth focusing adjustments. Multi-coated, 4-element Plossl 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 facilitate setting the appropriate amount of friction, assuring smooth vertical and horizontal manual movement without free-play from small bumps or gusts of wind. 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.


Optical Design


Primary Aperture (mm)

305mm (12″)

Focal Ratio


Focal Length (mm)


Secondary Diameter (mm)


Secondary Obstruction by Area


Mirror Coatings

94% Aluminum

Glass Type


Included Finder

8×50 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


2″ Crayford



OTA Weight (with accessories)

46.2 lbs

OTA Length

Retracted: 36″ Extended: 55″

Zenith Eyepiece Height


OTA Outer Diameter


Dobsonian Base Weight

38.3 lbs

Base Size

Height: 25″
Width: 29″

Dawes Limit


Rayleigh Limit


Limiting Magnitude


Light Gathering (compared to next size down)

44% (compared to 10″)

Minimum Magnification


Maximum Magnification


Barcode: 050234117401