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INSTRUCTION MANUAL
Orion SkyQuest
XT PLUS
™
Dobsonians
#8985 XT6 PLUS, #8974 XT8 PLUS, #8987 XT10 PLUS
#8974
Customer Support:
www.OrionTelescopes.com/contactus
Corporate Offices:
89 Hangar Way, Watsonville CA 95076 - USA
Providing Exceptional Consumer Optical Products Since 1975
Copyright © 2013-2014 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 493 Rev. D 10/17
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Summary of Contents for ORION TELESCOPES & BINOCULARS SkyQuest XT PLUS Dobsonians
- Page 1 INSTRUCTION MANUAL Orion SkyQuest XT PLUS ™ Dobsonians #8985 XT6 PLUS, #8974 XT8 PLUS, #8987 XT10 PLUS #8974 Customer Support: www.OrionTelescopes.com/contactus Corporate Offices: 89 Hangar Way, Watsonville CA 95076 - USA Providing Exceptional Consumer Optical Products Since 1975 Copyright © 2013-2014 Orion Telescopes & Binoculars All Rights Reserved.
- Page 2 25mm 10mm Sirius Plössl Sirius Plössl Finder II eyepiece, eyepiece, 28mm 1.25" 1.25" DeepView Solar (XT6 only) Shorty 2x EZ Finder II eyepiece filter Barlow lens 28mm DeepView eyepiece, 2" Dual-speed (XT8 and Crayford XT10) focuser (XT8 and 2" Extension Course XT10) adapter (XT8...
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Page 3: Table Of Contents
Welcome to an exciting new world of adventure! Your SkyQuest XT PLUS Dobsonian is a high-quality optical instrument designed to bring you dazzling views of the universe on any clear night. Easy enough for an absolute beginner to use, but powerful enough to please even experienced amateur astronomers, XT PLUS Dobs will provide years of fun discovery for the entire family. -
Page 4: Telescope Assembly
2. Telescope Assembly Assembly of the Dobsonian Base Now that you have unpacked the boxes and familiarized your- Left self with all the parts in front of you, it’s time to begin assembly. The optics of the telescope are already installed in the tube, so most of the required assembly concerns the Dobsonian base. - Page 5 Figure 4. Three plastic bushings used in the assembly of the XT PLUS. Figure 6. Use the two included open-end wrenches as shown to attach the bottom groundplate to the top groundplate. Low- 33.75mm friction bushing washer Figure 5. Assembly of the groundplates. lock nut will make the base difficult to rotate in the azimuthal (horizontal) direction.
- Page 6 Low-friction washer Telescope side bearings Metal washer Bearing Figure 9. Assembling the tensioning knob. First place a cylinders metal washer on the bolt, then thread on the white, low- (x4) friction washer until it is all the way on. Both washers will now be held captive on the bolt.
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Page 7: Using Your Telescope
Power knob Azimuth adjustment knob Altitude adjustment knob Battery casing Thumbscrews Dovetail mounting bracket Figure 11. The EZ Finder II reflex sight. Thumbscrew Dovetail mounting shoe Figure 12. Slide the EZ Finder II into the dovetail shoe and secure it with the thumbscrew. Note the correct orientation of the EZ Finder. - Page 8 1.25" Collar Thumbscrew (x2) Focus Focus 2" accessory knob knob collar 1.25" adapter Focus lock 2" accessory thumbscrew collar Drawtube tensioning setscrew 2" extension adapter Figure 15. (a) Removing the 2" accessory collar (XT8 y XT 10 PLUS only), (b) Thread the 2" extension adapter into Fine focus the focuser drawtube.
- Page 9 adapter into the extension adapter, then insert the eyepiece into the 1.25" adapter. Using the EZ Finder II The EZ Finder II works by projecting a tiny red dot (it’s not a laser beam!) onto a lens mounted in the front of the unit. When you look through the EZ Finder II, the red dot will appear to float in space, helping you locate your target object (Figure 16).
- Page 10 Figure 18. Do not attempt to carry the fully assembled telescope by the handle on the base! The front of the optical tube could contact the ground and damage the tube, the focuser, and any attached accessories. (XT8 PLUS shown) Figure 17.
- Page 11 Eyepiece Barlow 1.25" adapter Figure 20. The included Safety Film Solar Filter snaps onto the front of the telescope for safe viewing of our Sun through the telescope eyepiece. DO NOT look through the EZ Finder Figure 19. The Shorty 2x Barlow is installed in the II to center the Sun in the telescope’s field of view! focuser’s 1.25"...
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Page 12: Collimation
Figure 21. The quick collimation cap, which features a reflective inner surface, helps in centering reflections of the optics in the focuser during the collimation process. Figure 22. The telescope ready for collimation, with the tube oriented horizontally, the collimation cap in place on the focuser, and a piece of white paper placed inside the tube opposite the focuser. - Page 13 Secondary collimation thumbscrews Center screw Spider vanes Secondary mirror Figure 24. The secondary mirror and “spider.” The XT PLUS features three thumbscrews for easy adjustment of the secondary mirror tilt. limation is easy to perform. Figures 23a through 23e assume you have the collimation cap in place.
- Page 14 Locking thumbscrew Figure 27. A star test will determine if a telescope’s optics are properly collimated. An unfocused view of a bright star through the eyepiece should appear as illustrated on the right if the optics are perfectly collimated. If the circle is unsymmetrical, as in the illustration on the left, the scope Collimation needs collimation.
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Page 15: Specifications
5. Specifications Optical tube SkyQuest XT6 PLUS material: Rolled steel Primary mirror Eyepieces: 10mm Sirius Plössl, 1.25" barrel dia. focal length: 1200mm 28mm DeepView, 2" barrel dia. Primary mirror diameter: 150mm Magnification with supplied eyepieces: 120x (10mm Sirius) Minor axis of secondary mirror: 34mm 43x (28mm DeepView) - Page 16 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.
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