DOB 6" Traditional

The Sky-Watcher Dobsonian Telescope 153mm/1200mm (6") 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 mov...