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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
#8268 6" f/9 RC
#8267 8" f/8 RC
#8266 10" f/8 RC
#8267
#8266
#8268
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. B 5/15
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Related Manuals for Orion Ritchey-Chretien 8268
Summary of Contents for Orion Ritchey-Chretien 8268
- Page 1 M a n u a l Orion Ritchey-Chrétien ® Astrographs #8268 6" f/9 RC #8267 8" f/8 RC #8266 10" f/8 RC #8267 #8266 #8268 Providing Exceptional Consumer Optical Products Since 1975 OrionTelescopes.com...
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Page 2: Parts List
Even the vaunted Hubble Space that all pieces are present and intact. Refer to the Parts List to Telescope is an RC! Orion RCs deliver exceptional aid in identifying the included items. image quality and resolution with zero image shift,... - Page 3 Grip-ring Dovetail finder scope bases Focuser attachment collar Coarse focus knob Fine focus knob Coarse focus knob Millimeter and inch scales Drawtube 2" accessary collar Thumbscrew locks 1.25" adapter Brass compression ring Drawtube tension Drawtube adjustment knob lock knob Figure 1. A) The 6" RC’s Crayford focuser, top view. B) Both the drawtube tensioning and lock knobs are located on the underside of the focuser.
- Page 4 Extension Rings of common scenarios. So for instance, for DSLR cameras and most visual applications you will need 3" of extension (one 1" ring and one 2" ring) between the OTA and the focuser. Larger Included with your RC telescope are three thread-on exten- 2"...
- Page 5 Eyepiece Standard Visual Configuration Diagonal Focuser 2" extension 1" extension (w/ 1.25" adapter) Optical tube Typical CCD Camera Configuration CCD Camera 2" camera Focuser 2" extension 1" extension 1" extension adapter Optical tube CCD with Off-Axis Guider Configuration Focuser 2" extension CCD Camera Off-axis guider Optical tube...
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Page 6: Mounting The Telescope
(Figure 7), custom designed by Scopes and guiding Solutions Orion, to allow mounting of a guidescope or a DSLR camera for piggyback photography, or even a second, piggybacked Unlike other Ritchey-Chretien telescopes on the market, telescope for visual use or imaging. - Page 7 Secondary mirror holder Optical Reflective surface of axis collimating eyepiece Secondary mirror center ring Collimation eyepiece mark Spider vanes Figure 9. The view through a collimating eyepiece (not to scale). A) Shows the Ritchey-Chrétien aligned with all components identified. B) Shows the secondary out of alignment.
- Page 8 screws at the front of the secondary mirror holder (Figure 10). This will adjust the tilt of the secondary, changing the relative position of the secondary center ring when peering through the collimation eyepiece. Secondary Mirror Adjustment NOTE: Only adjust the three screws around the perimeter of the holder—do not adjust the center screw! (Figure 10).
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Page 9: Care And Cleaning Of The Optics
In the event internal cleaning is necessary the telescope should be shipped to Orion Telescopes and Binoculars for service. This telescope does not contain user-serviceable parts and disassembly of the components will void the warranty. When not in use, please use the supplied dust cap(s) to keep dust and particulates out of the tube and off the optics. -
Page 10: Specifications
Specifications 6" Ritchey-Chrétien Aperture: 6" (150mm) Focal Length 1370 mm Focal Ratio Mirror figure: Hyperbolic Mirror material BK-7 Mirror Coating Enhanced, 94%-96% reflectivity with SiO2 overcoat Optical Tube Steel Focuser 2" Crayford, dual speed (10:1) Drawtube travel: 34mm Backfocus distance: 240.1mm from rear cell;... - Page 11 10" Ritchey-Chrétien Aperture: 10" (250mm) Focal length: 2000mm Focal ratio: Mirror figure: Hyperbolic Mirror material: Fused quartz Mirror Coating: Enhanced, 94%-96% reflectivity with SiO2 overcoat Optical Tube: Steel Focuser: 3.3" Linear-bearing Crayford, dual speed (10:1) Drawtube travel: 50mm Backfocus distance: 243.9mm from rear cell;...
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Page 12: One-Year Limited Warranty
One-Year Limited Warranty This Orion product is warranted against defects in materials or workmanship for a period of one year from the date of purchase. This warranty is for the benefit of the original retail purchaser only. 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.