Omegon Pro Ritchey Chretien 154 Operating Manual

Full tube ritchey chretien telescopes

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Operating Manual

Full Tube Ritchey Chretien Telescopes

Omegon® Pro Ritchey Chretien

154/203/254

German Version 6.2017 Rev A 53809; 53810; 53811

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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Summary of Contents for Omegon Pro Ritchey Chretien 154

Page 1 Operating Manual Full Tube Ritchey Chretien Telescopes Omegon® Pro Ritchey Chretien 154/203/254 German Version 6.2017 Rev A 53809; 53810; 53811 Any form of reproduction of the entire contents of this document or parts thereof beyond the private use is strictly prohibited.
Page 2 Omegon® Pro Ritchey Chretien Full Tube Congratulations for the purchase of your new Omegon® Pro Ritchey Chretien telescope. Among the Cassegrain systems the Ritchey- Chretien is the unrivalled champion: it is the two-mirror telescope with the highest correction level available. In contrast to other variants, like Pressmann-Charmichel, Dall-Kirkham or the classical Cassegrain, the Ritchey-Chretien reflector shows you a completely coma-free field full of round stars even without an additional corrector.
Page 3 Preparation. Before you start using the equipment it is important to know the main control elements. There are two groups of control elements, as shown (Fig. 1 - 6). 1) Optical tube 2) Secondary mirror 3) Secondary mirror holding screw 4) 3x secondary mirror adjustment screws 5) Secondary mirror cell with lens shade Figure 1...
Page 4 8) Finderbase, Vixen standard 9) Cap nut to fasten the focuser 10) Focuser Figure 4 11) Eyepiece clamping 12) Thumbscrew for 2” connection 12) Reducing adapter 2”/1.25” with protection ring and thumbscrew 12) Coarse focusing right 13) Fine focusing 14) Coarse focusing left 15) Focuser clamping screw Figure 5 16) 50mm focuser extension sleeve...
Page 5 This design gives you the benefit of being flexible when it comes to usable accessories. Depending on the aperture, your Omegon Ritchey- Chretien telescope is either fitted with a 2” or a 3” focuser and the matching spacer sleeves.
Page 6 For the following procedure we will use: 33141 Omegon Collimation Eyepiece 4577 Omegon Newton Laser Pointer 1.25'' with sight glass Any form of reproduction of the entire contents of this document or parts thereof beyond the private use is strictly prohibited.
Page 7 You see a small circle in the middle of the secondary mirror. This is the centre marking of the secondary mirror. Now insert the 4577 Omegon laser pointer into the eyepiece holder and switch it on. Under ideal conditions you will now see the laser reflex in the centre marking of the secondary mirror, and the laser point will also be visible in the sight glass of the laser pointer.
Page 8 Figure 7 This is what you should see when looking through a well adjusted Ritchey-Chretien telescope with the 33141 Omegon Collimation Eyepiece. You will see the following pieces: i. The grey slanted cross is the reticule of the collimation eyepiece.
Page 9 using an artificial or real star. The following, extremely enlarged picture shows the ideal star, as it should be visible in the centre of the field of vision in the telescope – a round bright circle, the so- called Airy disc, with one or several concentric, round diffraction rings. Please note, that this picture will normally not be visible, even with a perfectly adjusted optical system –...
Page 10 Appendix A: Technical Data 53809 Omegon Pro Ritchey-Chrétien 154/1370 Aperture 154mm Focal length 1.370mm Aperture ratio Tube construction Full tube type Optics type Ritchey-Chretien Cassegrain with two hyperbolic mirrors Mirror substrate BK-7/H-K9L Obstruction caused by secondary mirror holder 72mm Lens shades...
Page 11 53810 Omegon Pro Ritchey-Chrétien 203/1624 Aperture 203mm Focal length 1.625mm Aperture ratio Tube construction Full tube type Tube material Steel Optics type Ritchey-Chretien Cassegrain with two hyperbolic mirrors Mirror substrate Quartz crystal with extremely low thermal length extension Obstruction caused by secondary mirror holder...
Page 12 53811 Omegon Pro Ritchey-Chrétien 254/2000 Aperture 254mm Focal length 2.000mm Aperture ratio Tube construction Full tube type Tube material Steel Optics type Ritchey-Chretien Cassegrain with two hyperbolic mirrors Mirror substrate Quartz crystal with extremely low thermal length extension Obstruction caused by secondary mirror holder 110mm(43% of diameter, 18.75% of area)
Page 13 Appendix B: Recommended accessories 33141 Omegon Collimation Eyepiece 4577 Omegon Newton Laser Pointer 1.25” with sight glass 51284 Astro Physics 0.67x Reducer 2” 32974 Omegon red dot finder Deluxe 47014 Omegon LED finder Any form of reproduction of the entire contents of this document or parts thereof beyond the private use is strictly prohibited.
Page 14 Only use cleaning fluid if distilled water is not able to remove the dirt. Ideal for this purpose are special fluids, e.g. the fluid contained in the 5551 Omegon® 5 in 1 cleaning set. If you want to mix your own cleaning fluid you must always make sure, to solely use clean components from a chemist shop.

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