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Instruction Manual
Omegon® Pro Dobson 203/1200 DOB
Omegon® Pro Dobson 254/1250 DOB
Omegon® Pro Dobson 304/1500 DOB
English version 02.2019 Rev.B Art-Nr. 54680, 54681, 54683, 54684
Any form of reproduction of the entire contents of this document or parts thereof beyond the private use is strictly prohibited.
54680_EN_Instruction_Manual_REV_B 1 / 5
Subject to alterations and errors. All texts, illustrations and symbols are the property of nimax GmbH.
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The Omegon® Pro Dob Series
Congratulations on the purchase of one of the new
Omegon® Pro Dob Series telescope. This telescope
will give you hours of fun, with its optical precision
polished mirrors and huge light gathering
capability; it is the ideal companion for the
intermediate and advanced amateur. It’s simple
design and optical quality makes the Pro Dob one of
the most exciting Dobson telescopes you will ever
find in the market.
1. What’s included? The telescope is shipped in
two boxes. The tube box and the base box. To keep
box volume to a minimum, the base is supplied
disassembled. To assemble the base you only need
a screw driver (Philips-type) – not supplied.
Assembly takes about 20 minutes and all supplied
parts and ware are easily put together. Below you
can see the included base parts and ware. Please
take a few minutes to familiarize yourself with it.
Telescope base parts
1,2 & 3. Needle bearing kit; 9. Eyepiece rack & screws;
4. Disc (top); 10. Handle & screw;
5. Disc (bottom); 11. Feet & screws;
6. Side panel (right); 12. Side friction kit;
7. Front panel; 13. Wood screws;
8. Side panel (left); 14. Azimuth friction kit.
2. Assembling the telescope base. The telescope
base is shipped in a flat cardboard box. Please
provide a clean and flat surface where you can lay
the parts and enough space to assemble it.
2.1. Step 1 - Assembling the side and front panels.
Identify parts #6, #7 and #8. Used the supplied
Allen wrench and 4x of the wood screws #13.
Please notice that the side panels #6 and #7 are
slightly different. Panel #6 has two additional holes
to fix the eyepiece rack #9. The frontal panel #7 has
two sides. Make sure that the metal washers are
not visible from the outside. When Step 1 is
finished make sure that the side panel (right) #6 is
on the right side of this assembly and the front
panel washer (plated) do not show to the outside -
marked with arrows - below.
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Subject to alterations and errors. All texts, illustrations and symbols are the property of nimax GmbH.
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2.2. Step 2 – Fixing the Disc (top). Please use another 6x wood screws #13. Use the Allen wrench to tighten the screws.
Figure 1. Exploded view of the complete assembly.
Please notice that the Disc (top) #4 has two sides. A side with circles cut in the wood’s surface to hide the screw heads.
Tighten the screws from this side.
2.3. Step 3 – Setting the feet to the Disc (bottom).
Before proceeding with the assembly, set the 3x
feet and screws #11 to the Disc (bottom) #5. Make
sure to fix the feet to the side where the metal nut
is flush to the disc’s surface (arrow below. It is
important to identify and fix the feet to the correct
side.
2.4. Step 4 – Preparing the needle bearing kit #1,
2 & 3. Please make a “sandwich” with the two
metal discs and the needle bearing as shown
below. This “sandwich” should be set between the
assembly in 2.2. and 2.3 as shown in the next step.
Solar Warning! Do not point the telescope to the Sun, concentrated light will cause irreversible eye
damage and even blindness!
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Subject to alterations and errors. All texts, illustrations and symbols are the property of nimax GmbH.
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2.5. Step 5 – Fixing the Disc (bottom) #5 to the pre-assembled wood parts and
Did you know? The Hand knob
adjusts the friction of the azimuth
movement. The unique design of
the needle bearing system on the
azimuth axis creates a butter
smooth azimuth movement. If you
feel, however, that the movement
is too smooth, just give a quarter of
turn and tighten the central hand
knob. This will visibly increase the
friction making the movement
stiffer. If on the contrary the
movement is too stiff, release the
hand knob for a smoother
movement.
Figure 2.
needle bearing. Please proceed as shown making sure that the ball bearing sits
between the two supplied washers – arrow on the image. The handknob allows to
adjust pressure to the needle bearing increasing/decreasing friction.
2.6. Step 6 – Setting the Handle #10 and eyepiece rack #9.
Use the supplied screws to fix both the Handle and eyepiece rack as shown in
figure 1 and figure 2.
The one time assembly of the telescope base is now completed. It can be easily
carried with one hand using the handle. The eyepiece rack can be used to store
eyepieces and Barlow (not included) during observations.
The optical tube is the other main part of this telescope. It already comes preassembled (except the side friction kit#12). Depending on the weight of eyepiece,
Barlow or finderscope the tube may tilt to the front or the back during
observation. To avoid this inconvenient problem we have included a unique side
friction kit #12 that allows to increase the friction. Please look at the main features
of the optical tube and how to assemble the side friction kit #12.
3. The optical tube. Please look at the main features of the optical tube in the
figure below.
Optical tube features A – Side bearing B – Focuser C – Finderscope base
A dust cap for the front aperture and for the focuser are also included. Please make sure to use it to protect the telescope
from dust and humidity. The telescope should always be stored in a clean and dry place.
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Subject to alterations and errors. All texts, illustrations and symbols are the property of nimax GmbH.
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3.1. Installing the optical tube to the telescope base.
How to adjust the friction? Tighten or release the hand knobs to
adjust friction. For heavy finderscopes or eyepieces, you may
want to slide the side friction kit to a better position. Remember
to always make this adjustment on both sides of the telescope
tube using the same marks.
The tube fits to the assembled base as shown. For convenient transportation,
both tube and base should set apart after each observation.
3.2. Installing the side friction kit to the bearing. To increase the friction on the tube bearings,
a tension and sliding system is used. As previously mentioned, this avoids the inconvenient tilt
of unbalanced telescope tubes. Please identify the different components and assemble it as
shown. Fix both Side friction kit #12 to the telescope bearings. Use the supplied Allen wrench.
The side bearing has different marks, make sure both sides indicate the same marks. Slide to
adjust balance to the accessories’ weight.
3.3. Balancing the telescope. Install the finderscope and eyepiece. If the
telescope tube tilts (to the front or the back), release the side friction kit and
slide it in the direction of the unbalancing.
3.4. Installing the Finderscope. Start by sliding the supplied O-ring to the tube
mark (arrow below). Next, slide the finderscope bracket and use the thumbscrew
to tighten it in place. The finderscope tube can be fitted to the finderscope
bracket. Make sure that the adjustment screws sit on the finderscope tube
recess and the O-Ring on the front.
Specifications Pro Dob 203/1200 Pro Dob 254/1250 Pro Dob 304/1500
Aperture 203mm 254mm 304mm
Focal length 1200mm 1250mm 1500mm
Focal ratio f/6 F/4.9 F/4.9
Focuser Crayford 2”/1.25” adapter Crayford 2”/1.25” adapter Crayford 2”/1.25” adapter
Eyepiece rack yes yes yes
Eyepiece SWA 32mm SWA 32mm SWA 32mm
Finderscope LED Deluxe LED Deluxe LED Deluxe
Some models may be supplied without focuser, eyepiece and finderscope. Please refer to the exact model in our website.
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Any form of reproduction of the entire contents of this document or parts thereof beyond the private use is strictly prohibited.
Subject to alterations and errors. All texts, illustrations and symbols are the property of nimax GmbH.
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