Sky-Watcher Dobsonian Sale!
- Sky-Watcher Newtonian Reflector (Parabolic) on Dobsonian Mount
- Diameter 203mm
- Focal Length 1200mm
- Secondary Mirror Diameter 47mm
- F/Ratio F/5.9
- Finder Scope 8×50
- Focuser Diameter 2″ crayford
- Eye Piece 1.25″ Super 25mm and 10mm
- Tube Weight 11kg
- Tube Dimensions 20.5cm x 112cm
- Shipped in two boxes 17kg, 126 x 40 x 45 cm; 15kg, 77x67x12 cm
The Sky-Watcher Dobsonian Telescope 203mm (8″)/1200mm 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. This model includes a 2″ focuser with a 1.25″ adapter, allowing the use of either eyepiece size. It also includes the new feature-tension control handle.
WHAT is Dobsonian Telescope and WHY the Tension Control Handle?
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 to pivot 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 filled of view. If there is too little friction, the telescope will not stay where it is positioned. The Sky-Watcher Tension Control Handle provides a tension adjuster that users can easily turn to add or reduce tension, 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.
Free shipping or pick-up in the Greater Victoria Area. For customers outside the Greater Victoria Area, please contact us for shipping arrangements to order this product, owing to the size of this telescope and mount.