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INSTRUCTION MANUAL
Orion
10" and 12" f/8 Truss
®
Tube Ritchey-Chrétien
Astrographs
#51874 10" TTRC, #51875 12" TTRC
#51874
#51875
Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA
Toll Free USA & Canada: (800) 447-1001
International: +1(831) 763-7000
Customer Support: support@telescope.com
A N E M P L O Y E E - O W N E D C O M P A N Y
Copyright © 2020 Orion Telescopes & Binoculars. All Rights Reserved. No part of this product instruction or any of its contents
may be reproduced, copied, modified or adapted, without the prior written consent of Orion Telescopes & Binoculars.
IN 632 01/19
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Related Manuals for ORION TELESCOPES & BINOCULARS 51874
Summary of Contents for ORION TELESCOPES & BINOCULARS 51874
- Page 1 INSTRUCTION MANUAL Orion 10" and 12" f/8 Truss ® Tube Ritchey-Chrétien Astrographs #51874 10" TTRC, #51875 12" TTRC #51874 #51875 Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA Toll Free USA & Canada: (800) 447-1001 International: +1(831) 763-7000 Customer Support: support@telescope.com...
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Page 2: Parts List
Congratulations on your purchase of an Orion Truss Tube Ritchey-Chretien Astrograph (TTRC). These compact but large-aperture telescopes are designed and optimized for high-performance astrophotography with CCD and DSLR cameras. Sporting an optical design comprising hyperbolic primary and secondary mirrors, the RC is highly regarded by advanced astrophotographers and pro- fessional observatories worldwide. - Page 3 Figure 3. The TTRC includes one 2” and two 1” thread-on extension rings as well as a battery holder (eight AA batteries not included). Drawtube Focuser lock knob attachment designed for installation individually or in combination between collar the optical tube and the focuser to take up unneeded backfo- cus.
- Page 4 sion rings. The backfocus distance of your camera’s sensor as D-type mounting bar on the telescope has two sets of predrilled well as the other components in your imaging train, e.g., focal and tapped holes that allow attachment of an Orion dovetail reducer or flattener, filter wheel, or off-axis guider, will influence finder scope base (part #7214) to the bar, should you desire to how much extension you will need to add between the optical...
- Page 5 Collimation You will use the three sets of three screws on the focuser tilt adjustment plate, shown in Figure 6. Each set consists of a center silver-colored socket head screw flanked by two smaller The optics in your new TTRC have been aligned at the factory. black socket head screws.
- Page 6 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). Shows the Ritchey-Chrétien aligned with all components identified. Shows the secondary out of alignment. Shows the optical axis out of alignment.
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Page 7: Care And Cleaning Of The Optics
Note that there are three pairs of screws on the rear cell of the optical tube, located about halfway between the focuser tilt adjustment plate and the outer edge of the rear cell (Figure 6). Each pair consists of a silver-colored Allen screw flanked by a smaller black Allen screw. -
Page 8: Specifications
Specifications 10" f/8 Truss Tube Ritchey-Chrétien Optical configuration Ritchey-Chrétien Optical tube Carbon fiber Serrurier truss tube design with CNC stainless steel and aluminum components Aperture 250mm (10") Focal length 2000mm Focal ratio Primary mirror figure Hyperbolic Primary mirror material Quartz Primary mirror coating Enhanced aluminum, no less than 94%, with SiO2 overcoat Secondary mirror figure... - Page 9 12" f/8 Truss Tube Ritchey-Chrétien Optical configuration Ritchey-Chrétien Optical tube Carbon fiber Serrurier truss tube design with CNC stainless steel and aluminum components Aperture 304mm (12") Focal length 2432mm Focal ratio Primary mirror figure Hyperbolic Primary mirror material Quartz Primary mirror coating Enhanced aluminum, no less than 94%, with SiO2 overcoat Secondary mirror figure Hyperbolic...
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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 peri- od 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 defec- tive, provided it is returned postage paid.
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