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Sky-Watcher 10" Traditional Dobsonian Telescope (AVAILABLE FOR IN-STORE PURCHASE ONLY)

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$1,199.99 CAD
The Sky-Watcher Traditional Dobsonian Telescope 254mm/1200mm (10") has a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with fine supports (0.5mm thick), to reduce diffraction spikes and light loss.  In addition, this model include a 2" focuser with a 1.25" adapter, allowing the use of either eyepiece size.  This model also include the new feature-tension control handle.

What is Dobsonian Telescope?

John Dobson, an avid amateur astronomer connected to the San Francisco Sidewalk Astronomers, designed a simple yet elegant telescope mount in the 1970’s that was easy to build and could handle a basic Newtonian telescope tube. Dobson wanted people to have the ability to build their own telescope out of inexpensive materials. In fact, hundreds of people, under Dobson’s tutelage, learned to grind their own mirrors, and these mirrors were put to use in what has come to be known as a “Dobsonian” telescope.

What makes a telescope a Dobsonian is the base that the telescope tube sits on. The tube itself is a simple Newtonian, designed by someone you may have heard of…Isaac Newton. Before John Dobson invented his simple telescope base, Newtonian telescopes were usually mounted on a large, heavy equatorial mount. They were neither simple, portable, nor inexpensive. Instead, Dobson made a heavy-duty box, modified to hold the optical tube, and mounted it on a lazy-suzan type base. The telescope tube only took a few simple modifications to allow it to ride on the base. When he had finished the final tweaking, a new alt-azimuth mount was born. The telescope could be pointed to anywhere in the sky by either rotating the box on the lazy-suzan base, or by pushing the telescope up or down. The Dobsonian was born.

How the Sky-Watcher Tension Control Handle Improved the Dobsonian

The Dobsonian mount usually relies on the friction between the side bearings on the optical tube of the telescope and a frictional material on the saddle to hold the optical tube in place. If there is too much friction, the telescope is difficult to move to center an object in the field of view. If there is too little friction, the telescope will not stay where it is positioned. This makes stabilizing the optical tube of the telescope difficult when using a Dobsonian mount, especially when accessories, such as a finderscope or an eyepiece, are added to the optical tube. As long as the amount of friction is at an appropriate level, and therefore stabilization of the optical tube is achieved, the telescope can remain in its desired position to view an object and maintain its position, even when the mount is rotated.

 

The currently available devices for stabilizing a telescope on a Dobsonian mount include a sliding weight to counter balance the weight of the telescope, a friction lock that must be adjusted to inhibit movement of the telescope, and a spring attached between the telescope tube and mount to aid in stabilization. These devices are inconvenient to use because they do not provide a simple and user-friendly way to adjust the friction.

The object of the Sky-Watcher Tension Control Handle invention (US Patent No. 6,940,642) is to provide a tension adjuster that users can easily turn to add or reduce tension, thereby increasing or decreasing the friction between the optical tube and the sideboard of the mount. By providing such a tension adjuster, the telescope does not need to be balanced in order to stay in position. The tension adjuster can be tightened such that the optical tube can stay in a position but can still be moved when prompted to adjust the position of the optical tube. Alternatively, the tension adjuster can be completely tightened to lock the optical tube in position.

Sky-Watcher Classic 10” Dobsonian Telescope

The Sky-Watcher 10” Dobsonian features a primary mirror made of Pyrex glass. Because of its very low coefficient of thermal expansion, Pyrex glass is less affected by changing temperatures. This greatly reduces the cooling time of a telescope larger than 8” in diameter without using an extra fan. The great stability of this low expansion glass ensures high quality images. It is also substantially more resistant to scratching then plate glass.

  • Optical Design: Newtonian
  • Mirror Type: Parabolic
  • Primary Mirror Aperture: 254 mm
  • Secondary Mirror Aperture: 58 mm
  • Focal Length: 1200 mm
  • F/Ratio: F/4.7
  • Highest Practical Power: 508x
  • Faintest Stellar Magnitude: 14.7
  • Finder Scope: 8x50
  • Focuser Diameter: 2” with 1.25” adapter
  • Eyepiece: 1.25" Super 25 mm and 10 mm
  • Tube Weight w/Accessories:
  • Shipping Weight: 31 kg total (two boxes)

Please note that this Dobsonian will need some assembly, especially the base, which is flat-packed.


Due to the currennt extreme high demand & very limited supply, all telescopes are available for in-store purchase ONLY.