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i n s t r u c t i o n M a n u a l
Orion
10"
®
Ritchey-Chrétien
Optical Tube Assembly
#8961
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 380 Rev. A 04/10
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Summary of Contents for ORION TELESCOPES & BINOCULARS 8961
- Page 1 M a n u a l Orion 10" ® Ritchey-Chrétien Optical Tube Assembly #8961 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 380 Rev. A 04/10...
- Page 2 Optical tube Battery Collimating pack eyepiece Extension rings Figure 1: The Ritchey-Chrétien Optical Tube. Congratulations on your purchase of an Orion als. In the event that the telescope needs to be shipped to Ritchey-Chrétien astrograph! another location, or returned for warranty repair, having the Astroimaging demands proper packaging will ensure that your telescope will survive high contrast and center to edge image sharpness.
- Page 3 Grip-ring Figure 3: Removing the focuser. Remove the focuser by gently turning the knurled silver grip-ring with the both hands (Figure 3). Turn counter- clockwise to loosen. Attach the extension ring of choice to the backend of the tube. The optical tube has external (male) threads. Subsequently you will use the end of the ring with internal (female) threads to attach.
- Page 4 Eyepiece Standard Visual Configuration Diagonal Focuser 2" extension (w/ 1.25" adapter) Optical tube StarShoot Deep Space Imager Configuration StarShoot CCD 2" camera Focuser 2" extension 1" extension Imager adapter Optical tube StarShoot with Off-Axis Guider Configuration StarShoot CCD Off-axis guider Focuser 1"...
- Page 5 Focus lock knob Finder scope dovetail holder Knurled 10:1 Fine silver focus knob grip-ring Metal thumbscrew Focus Coarse tension knob focus knobs Figure 5: Figure 6: Details of the linear bearing Crayford focuser. Finder scope dovetail base. es image shift by stabilizing the drawtube within the focuser When the finder bracket is securely in place retighten the metal thumbscrew.
- Page 6 Collimation adjustment push-pull screws Cooling Secondary fans mirror collimation adjustment screws Do not adjust center screw. DC 12V power jack for cooling fans Figure 7: Figure 8: The secondary mirror collimation adjustment screws. The Ritchey-Chrétien 10" OTA primary adjustment screws and cooling fans. limation eyepiece and the larger black circle outside that is secondary mirror is critical in determining if the optical axis the secondary holder.
- 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 Specifications Specifications Baffles: 9 knife-edge computer 10" f/8 positioned baffles plus Optical tube material: Steel internal micro-baffles along primary mirror baffle tube Optical configuration: Ritchey-Chrétien and secondary mirror light Figure: Hyperbolic shield Mirror material: Quartz Optical tube: Steel Mirror coating: Enhanced, no less than 94% Aperture: 250mm (9.8")
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