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Related Manuals for Omegon Dobson Advanced 203
Summary of Contents for Omegon Dobson Advanced 203
- Page 1 Instructions Manual Omegon® Dobson Advanced 203 English version 10.2015 Rev A...
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Page 2: Included Parts
The Omegon® Advanced Dobson 203 Congratulations on the purchase of the new Omegon® Advanced Dobson 203 telescope. This telescope will give you hours of fun, with its optical glass mirrors and light gathering capability, it is the ideal companion to start in the world of amateur astronomy. - Page 3 Figure 3. Assemble top base’s disc. Pay attention to the right side. Figure 2. Assemble side and front panels. Figure 5. Base is ready to receive base’s bottom disc. Figure 4. Tighten the parts using the supplied allen wrench. Figure 7. Use supplied nut wrenches to tightent. Figure 6.
- Page 4 Figure 9. Tighten telescope’s side bearings cylinders. Figure 8. Shaft placement sequence is important. Figure 10. Balance the R.A. axis with counterweight. Figure 10. Side disc for balance adjustment.
- Page 5 This shaft will aligned both base’s discs. Insert the bolt (part 1 fig.7) and make sure to use the washers (part 2 and 4 fig 7.) between the bolt and the disc. On the opposite side insert the washer and nut. Use the supplied nut wrenches (top-right fig.7).
- Page 6 Figure 2 Figure 3 Figure 14. The Balancing System. removing) the two cross head screw that secure the disc – fig.15. Use the supplied screwdriver. This allows the disc to be adjusted up-down if necessary so that the knob’s tip matches the exact position as seen in figure 14.
- Page 7 5. Optional accessories (not included ). The Omegon Dobson telescope is supplied as a basic setup configuration i.e. only the optical tube and base. The focuser, finder scope and other accessories such as eyepieces are not included. Why? Because we want to give users the chance to configure the telescope to their own needs.
- Page 8 6. What can been seen with this telescope? Below you will find some examples of what you can expect to see when using this telescope. 6.1. The Moon is one of the most spectular objects to be seen through a telescope. Even a small telescope will reveal high detail of the Moon’s surface.
- Page 9 Telescope’s focal length is 1200mm. Eyepiece’s focal length is 20mm. Some possible accessory combinations Terrestrial Moon Deep Sky Jupiter and View Saturn Barlow Lens 2x 20mm Eyepiece 6mm Eyepiece Power Does not apply 200x 120x Omegon®/Vixen®/Celestron®/Orion®/ Meade® are registered trademarks.
- Page 10 APPENDIX A The Omegon® Red-dot finderscope (included only in the complete set) 1. Knowing your finderscope. 1- Red-dot case; 2- Potentiometer ON/OFF switch; 3- Optical window; 4- Azimuth adjustment knob; 5- Battery compartment (1x battery CR2032); 6- Base fixing screws;...
- Page 11 Figure 5. A red-dot is projected to the optical window. Figure 4. Red-dot lights up when ON. Figure 7. Turn altitude adjustment knob to align finder. Figure 6. Turn azimuth adjustment knob to align finder. Figure 8. Turn potentiometer OFF. Figure 9.
- Page 12 3. Aligning the finderscope 3.1. A distant object is centered at the telescope’s field of view. In this example we have a house with a chimney. The chimney is the reference point to place at the center of the field of view. We first look through the telescope with the lowest magnification possible, so we have the widest field of view.
- Page 13 Figure 9. Remove battery. Figure 10. Place battery. 4. Replacing the battery. The red-dot needs to be bright enough to be seen during the observation. After some hours of use the brightness may dim until it no longer can be seen. The battery needs to be replaced.
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Questions and answers
Yes I’ve assembled the telescope and done everything as shown in the manual and all I SEE IS WHITE BACKGROUND WHEN I LOOK THRU the scope. No images with the finder scope pointed at large images both day and night. What is wrong? IVE been playing with the adjustments for hours with no success
A white background with no images when using the Omegon Dobson Advanced 203 telescope could be caused by several factors:
1. Out of Focus – The telescope may not be properly focused. Adjust the focuser slowly to bring objects into view.
2. Incorrect Eyepiece Use – Ensure that an appropriate eyepiece is inserted correctly.
3. Daytime Observation – If used during the day, pointing the telescope at a bright sky without an object in view can result in a white background.
4. Obstruction in the Optical Path – Check for any obstructions like dust, covers, or misaligned mirrors that could prevent proper image formation.
5. Excessive Magnification – Using a high-magnification eyepiece without first centering and focusing on a lower magnification can make objects difficult to locate.
Adjusting the focus and ensuring proper setup should resolve the issue.
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