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Instruction Manual
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Dobson 102/640 DOB
English version 8.2014 Rev A
The Omegon® 102/640 DOB
Congratulations on the purchase of the new Omegon® 102/640 DOB. This small telescope will give
you hours of fun, with its all optical glass mirror and super compactness, and it is the ideal
companion to start in the world of amateur astronomy. With this telescope you will be able to see
the craters on the Moon, star clusters, some nebulae and a glimpse of the Jupiter disc features and
its Galilean moons and the rings of Saturn. We have included many accessories so it will be easy to
use this telescope.
1. Included parts
we have included several accessories that will make the use of the telescope easier and fun, please
take a look at the list of the parts so you can identify them in the future.
1. 3x magnification Barlow Lens;
2, and 3. Two eyepieces 1.25” (31.75mm); a H20mm and a H6mm eyepiece;
4. One Red Dot finderscope;
2. Getting Started.
It is very simple to get started. Here is how the
telescope works. The telescope aperture
should point to the object being observed. The
mirror on back of the tube will gather the light
coming from the object and reflects it to the
secondary mirror that brings it to the eyepiece.
Close to the aperture there is the focuser. The
focuser moves up and down to get a precise
focused image. At the focuser one can use the
supplied accessories. Different accessories
combinations give different results, such as
different image magnifications or correct
image for example. But all this will be
explained in detail in the next pages.
3. Assembly.
Your telescope comes fully
assembled. You just need to install the finderscope (figure 2 and 3) and place one of the supplied
eyepieces (figure 4 and 5) don’t forget to tighten the focuser thumbscrew to secure the eyepiece..
The dobsonian mount is a simple to use that moves up and down and rotates on its base. This is
great because makes the use of the telescopes extremely easy and intuitive. The side hand knob
(arrow figure 4) allows to increase friction and thus allowing to adjust smoothness of movement. To
start observing insert an eyepiece (start by the low power eyepiece H20mm) make sure to tighten
the focuser thumbscrew. Rotate the focuser knobs to get perfect focus. Start by choosing a distant
terrestrial object, like a distant tree or church tower. This will allow you to get familiarized with the
telescope operation for night use.
Figure 1. Parts list.
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ATTENTION! Never look at the Sun through a telescope.
Concentrated Sun light may cause serious eye injury.
Children should use only with adult supervision!
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