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Orion 8958 Manual

Ritchey-chrétien astrographs
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i n s t r u c t i o n M a n u a l
Orion
Ritchey-Chrétien
®
Astrographs
#8956 6" f/9 Ritchey-Chrétien Optical Tube Assembly
#8958 8" f/8 Ritchey-Chrétien Optical Tube Assembly
#8956
#8958
Providing Exceptional Consumer Optical Products Since 1975
OrionTelescopes.com
customer support (800) 676-1343 • E-mail: support@telescope.com
Corporate Offices (831) 763-7000 • 89 Hangar Way, Watsonville, CA 95076
IN 361 Rev. A 9/09

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Summary of Contents for Orion 8958

  • Page 1 M a n u a l Orion Ritchey-Chrétien ® Astrographs #8956 6" f/9 Ritchey-Chrétien Optical Tube Assembly #8958 8" f/8 Ritchey-Chrétien Optical Tube Assembly #8956 #8958 Providing Exceptional Consumer Optical Products Since 1975 OrionTelescopes.com customer support (800) 676-1343 • E-mail: support@telescope.com Corporate Offices (831) 763-7000 •...

  • Page 2: Parts List

    Extension rings Figure 1: The Ritchey-Chrétien Optical Tube (6" shown) Unpacking Your Telescope Congratulations on your purchase of an Orion Ritchey-Chrétien astrograph! Astroimaging Use care when unpacking the shipping carton. We recom- demands high contrast and center to edge image mend keeping the boxes and all original packaging materi- sharpness.
  • Page 3 Figure 4. To set up any Orion StarShoot Deep Space imagers use all three (1 x 2" and 2 x 1") of the supplied extension rings to reach focus. For DSLR and most visual applications use 3" of Figures 2a-d: Unpacking the Optical Tube.
  • Page 4 Eyepiece Standard Visual Configuration Diagonal Focuser 2” extension 1” extension (w/ 1.25” adapter) Optical tube StarShoot Deep Space Imager Configuration StarShoot CCD 2” camera Focuser 2” extension 1” extension 1” extension Imager adapter Optical tube StarShoot with Off-Axis Guider Configuration Focuser 2”...

  • Page 5: Focusing The Telescope

    2. Insert the bracket into the dovetail from the back of the Focusing the Telescope telescope, until it stops. One of the exciting new features of the Orion Ritchey- 3. When the finder bracket is securely in place retighten the Chrétien optical tubes is the inclusion of the new linear bear- metal thumbscrew.

  • Page 6: Image Orientation

    Secondary mirror collimation adjustment screws Do not adjust center screw. Collimation adjustment Optical push-pull screws axis Figure 7: Figure 8 The secondary mirror collimation adjustment screws. : The Ritchey-Chrétien with the focuser removed to show the three sets of optical axis adjustment screws. For illustration only: do not remove the focuser when performing collimation.
  • Page 7 Secondary mirror holder Optical Reflective surface of axis collimating eyepiece Secondary mirror center mark Border Collimation eyepiece mark Spider vanes Figure 9a-c: The view through the collimating eyepiece (not to scale). Figure 9a shows the Ritchey-Chrétien aligned with all components identified.

  • Page 8: Care And Cleaning Of The Optics

    Care and Cleaning of the event internal cleaning is necessary the telescope should be shipped to Orion Telescopes and Binoculars for service. the Optics This telescope does not contain user-servicable parts and disassembly of the components will void the warranty. When Do not disassemble the Ritchey-Chrétien for any reason,...

  • Page 9: One-Year Limited Warranty

    During this warranty period Orion Telescopes & Binoculars will repair or replace, at Orion’s option, any warranted instrument that proves to be defective, provided it is returned postage paid to: Orion Warranty Repair, 89 Hangar Way, Watsonville, CA 95076. Proof of purchase (such as a copy of the original receipt) is required.

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