Omegon Dobson 76/300 DOB Instruction Manual

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Instruction Manual

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Dobson 76/300 DOB

English version 8.2014 Rev A

The Omegon® 76/300 DOB

Congratulations on the purchase of the new Omegon® 76/3006 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. 1.5x Erecting Lens;

2. 2x magnification Barlow Lens;
3, 4, 5 and 6. Four eyepieces 1.25” (31.75mm); a H20mm, H12.5mm, H6mm and a SR4mm eyepiece;

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. The tube and the dobsonian mount
were assembled in the factory. You just need to remove the dust cap from the telescope’s aperture
and start using your telescope. The dobsonian mount is a simple telescope mount 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 allows to increase friction and thus allowing to adjust smoothness
of movement (figure 4). 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. For terrestrial view you can use
the supplied erecting lens (as shown in figure 6).

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!