8″ Sky-Watcher Dobsonian

(1 customer review)


The Sky-Watcher Dobsonian Telescope 203mm/1200mm (8″) have 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.

Recommend for First Time Buyer

Out of stock


Dobsonian 8″ Traditional

The Sky-Watcher Dobsonian Telescope 203mm/1200mm 8″) have 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 includes a 2″ focuser with a 1.25″ adapter, allowing the use of either eyepiece size. This model also includes the new feature-tension control handle.

What is Dobsonian Telescope and why the Tension Control Handle?

A simple, elegant form of an alt-azimuth mount made to carry a Newtonian reflector was popularized by John Dobson in the late 1970’s. The Dobsonian mounted telescope is popular among amateur astronomers and telescope makers because of its simplicity. In its simplest form, the Dobsonian mount consists of a box which allows the optical tube assembly for pivoting in altitude, while the box itself is swiveled on a base in azimuth.

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 devices for stabilizing a telescope on the Dobsonian mount currently available include a sliceable weight to counterbalance the weight of the telescope, a friction lock that must be adjusted to inhibit movement of the telescope, and a spring attached to 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 (Patented) 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.

Recommend for First Time Buyer

dobsonian size comparison

dobsonian size comparison

  • Optical Design: Newtonian (parabolic primary mirror)
  • Aperture: 200mm
  • Focal Length: 1200mm
  • Focal Ratio: f/6
  • Resolving Power: 0.60″
  • Stellar Limit Magnitude: 12.9
  • Highest Practical Magnification: 400X
  • Light gathering power (compared to the unaided eye): 816
  • Focuser: 2″ Crayford with 1.25″ adaptor

In The Box:

  • Finderscope 6X30 straight version
  • Eyepiece 1.25″ Super 25mm (48x)
  • Eyepiece 1.25″ Super 10mm (120x)
  • Eyepiece adaptor from 2″ to 1.25″ with M42 thread
  • 2″ Tube Extension

Additional information

Weight 13 kg
Dimensions 102 × 38 × 45 cm

1 review for 8″ Sky-Watcher Dobsonian

  1. Johann Bester (verified owner)

    If you are a beginner or wanting to upgrade from a smaller scope GET THIS ONE.

    I have been observing with a 4inch (100mm) on a equatorial mount and this is a big jump and completely worth it.

    I could make out individual stars in Omega Centauri.

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