Sky-Watcher S11620 User Manual

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ointing the Dobsonian

Pointing an altitude-azimuth (alt-az) mounted telescope, such as a Dobsonian, is relatively easy. With the

mount level, you can swivel the telescope around on a plane parallel to your horizon and then tilt it up and

down from there (Fig.f). You can think of it as turning your telescope in azimuth until it is facing the horizon

below a celestial object and then tilting it up to the object's altitude. However, the Earth rotates and therefore

the stars are constantly moving, so to track with this mount you have to constantly nudge the optical tube in

both azimuth and altitude to keep the object in the field.

In reference material for your local position, the altitude will be listed as ±degrees (minutes, seconds) above

or below your horizon. Azimuth may be listed by the cardinal compass points such as N, SW, ENE, etc., but

it is usually listed in 360 degree (minutes, seconds) steps clockwise from North (0˚), with East, South and

West being 90˚, 180˚ and 270 ˚, respectively (Fig.f).

sing the Tension Control Handle

Loosen or tightend the tension control handle to add just enough

friction to allow the tube to move easily when nudged but to stay

in position when not. It may be necessary to re-adjust the tension

control handle when accessories are added to, or removed from,

the tube. The tension control handle should be installed on the

same side as the eyepiece for your convenience. Leave the

handle on the other side slightly loose to allow full tension control

for the tension control handle (Fig.e).

Fig.e

tension control

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Sky-Watcher S11620 Classic 250 Dobsonian 10-inch Aperature Telescope – Solid-Tube – Simple, Traditional Design – Easy to Use, Perfect for Beginners ( )