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i n s t r u c t i o n M a n u a l
Orion
SkyQuest
XTg
®
™
GoTo Dobsonians
#10134 XT8g, #10135 XT10g, #10136 XT12g
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
© 2010-2012 Orion Telescopes & Binoculars
IN 388 Rev. C 06/12
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Summary of Contents for Orion SkyQuest 10135XT12g
- Page 1 #10134 XT8g, #10135 XT10g, #10136 XT12g 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 © 2010-2012 Orion Telescopes & Binoculars IN 388 Rev. C 06/12...
- Page 2 EZ Finder II 28mm DeepView 2" eyepiece 2" Dual-speed Crayford focuser Optical tube Navigation knob Tube connecting knob GoTo hand controller Handle Altitude motor housing 12.5mm Illuminated Plössl 1.25" eyepiece Eyepiece rack Handle Azimuth motor housing (not shown) Dobsonian base Polyethylene foam dust guard Figure 1.
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Page 3: Table Of Contents
Please read these instructions thoroughly before beginning location, or returned to Orion for warranty repair, having the assembly and subsequent use of the telescope. proper packaging will help ensure that your telescope will sur- vive the journey intact. - Page 4 Ground baseplate assembly Front panel Machine Base (with azimuth motor) screws Base feet assembly with wood washers screws Left Hex keys panel Right (with panel altitude motor) Screwdriver Cables Wood Base hardware Tube connecting screws and handle knob Hand controller Figure 3.
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Page 5: Assembly
Figure 7. Figure 8. Attaching the base feet to the base. Secure the front panel to each side panel. 2. Assembly Now that you have unpacked the boxes and familiarized yourself with all the parts in front of you, it is time to begin assembly. - Page 6 Cutout holes Threaded inserts Figure 10. Figure 12. Align the holes on the side panels with the threaded To remove the rear end ring, unthread the six screws inserts in the baseplate. that connect it to the tube. not tighten completely yet. Place the eyepiece rack on those screws using the wide holes on the rack and slide it downward so the narrow portion is under the screws.
- Page 7 Shaft Spring Figure 13. Place the three springs on the exposed threaded shafts of the mirror cell. Figure 16. Locate the area of tube that is bulging out and preventing the end ring from fully seating. Warning: Once the rear end ring is removed from the tube, the raw edge of the tube itself will be exposed.
- Page 8 Threaded hole for tube connecting knob Figure 17. The cast-metal dovetail trunnion on the left side panel of the base mates with the left side bearing of the telescope tube. Before mounting the tube on the base, turn the trunnion by hand so that the hole for the tube connecting knob is facing up.
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Page 9: Replacing The Battery
1.25" adapter 1.25" adapter thumbscrew Power 2" adapter knob Focus lock 2" adapter thumbscrew thumbscrews Azimuth adjustment Fine knob focus knob Altitude Battery adjustment casing Coarse Coarse knob Thumbscrews Dovetail focus knob focus knob mounting bracket Drawtube tension setscrews Figure 20. Figure 21. -
Page 10: The Goto Hand Controller
3. The GoTo Hand Controller The SkyQuest XTg features the SynScan AZ hand controller, Display screen which provides two different modes of operation: AutoTracking Mode Mode buttons The SkyQuest XTg base incorporates a quad-encoder design that records the position of the telescope relative to the sky. Directional buttons In the AutoTracking mode, after a quick initial alignment pro- cedure, you can move the telescope manually, or electroni-... -
Page 11: Setup For Autotracking Or Goto Mode
scope. The left and right directional buttons can also be used to move the text cursor when entering data on the hand con- troller. Scroll Buttons The up and down scroll buttons allow you to move up and down within the menu tree or selections displayed on the hand controller LCD. -
Page 12: Using The Telescope In Autotracking Mode
must convert into degrees and arcminutes. To do this Note: The hand controllerís backlit display will become simply multiply the decimal value by 60. If your viewing dimmer and the button Illumination will turn off if left idle location is at latitude 36.95 N you would enter a latitude for 30 seconds. - Page 13 eyepiece. Once again, use the directional keys to do this. You may change the slewing speed by pressing the RATE button, and then choose a number between 0 (slowest) and 9 (fastest). You may find that Rate 4 is best for cen- tering the object in the EZ Finder, while Rate 3 or less is 315°...
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Page 14: Using The Telescope In Goto Mode
NOTE: When the power is on, you may choose to adjust 1) Dual Purpose Buttons (Figure 22a) the telescope electronically by using the hand control or TOUR – Takes you on a preset tour of your current sky. It will manually by pushing the tube with your hand. - Page 15 GPS – This allows you to obtain information from the optional unknown objects, interface the mount with a computer, and GPS receiver for Orion GoTo Mounts, if the GPS receiver is to use other equipment in conjunction with the SkyQuest connected.
- Page 16 Note: 10" model has 4 mirror clips Figure 25. Collimating the optics. When the mirrors are properly aligned, the view down the focuser drawtube should look like this. With the collimation cap in place, if the optics are out of alignment, the view might look something like this. Here, the secondary mirror is centered under the focuser, but it needs to be adjusted (tilted) so that the entire primary mirror is visible.
- Page 17 Figure 26. SkyQuest optical tube properly set up for collimation. Note the white paper placed across from the focuser, and the level angle of the optical tube. Ideally, the telescope should be pointing at a white wall. (IntelliScope model shown.) is pointed.
- Page 18 Figure 29. Figure 30. The three small thumbscrews that lock the primary The tilt of the primary mirror is adjusted by turning mirror in place must first be loosened before any adjustments can one or more of the three larger thumbscrews. be made.
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Page 19: System Requirements
Updating the GoTo Hand Controller’s Firmware From version 3.0 and up, the GoTo hand controller’s firmware can be updated over the internet. The firmware loader and firmware updates are available for download on the Orion website, OrionTelescopes.com Out of collimation Collimated Figure 31. -
Page 20: Collimating The Optical System
COM port. collimating when using the supplied collimation cap or other, more sophisticated collimation devices, such as the Orion Note: If the error message “Firmware update failed...” LaserMate Laser Collimator. -
Page 21: Using Your Telescope
mirror and the tilt of the primary mirror are the two collimation scope is out of collimation. The dark shadow cast by the sec- ondary mirror should appear in the very center of the out-of- adjustments that will be done most often. focus circle, like the hole in a doughnut. - Page 22 Viewing with Eyeglasses More typically, useful magnifications will be limited to 200x or less, regardless of aperture. This is because the Earth’s If you wear eyeglasses, you may be able to keep them on while atmosphere distorts light as it passes through. On nights of you observe, if your eyepieces have enough eye relief to allow good “seeing,”...
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Page 23: Astronomical Observing
Using the optional light shroud will be a necessity galaxies, and star clusters – or even very many stars, for (see below). Also, use of a light-pollution filter, like the Orion that matter. Your eyes take about 30 minutes to reach per- SkyGlow Broadband filter, can mitigate the effects of back- haps 80% of their full dark-adapted sensitivity. - Page 24 you’ve centered the object in the eyepiece, you can switch Jupiter, and Saturn are the brightest objects in the sky after the Sun and the Moon. Your XTg is capable of showing you to higher magnification (shorter focal length eyepiece), if you wish.
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Page 25: Care And Maintenance
Before doing so, remove the upper tube section of bright objects. Certain imaging accessories, such as the from the assembled telescope. Hold the secondary mirror sta- Orion SteadyPix, can help in obtaining images by the afocal tionary while loosening the center Phillips-head screw. Handle method. -
Page 26: Specifications
12. Specifications SkyQuest XT8g SkyQuest XT10g Primary mirror: 203mm diameter, parabolic, center-marked Primary mirror: 254mm diameter, parabolic, center-marked Focal length: 1200mm Focal length: 1200mm Focal ratio: f/5.9 Focal ratio: f/4.7 Focuser: Dual-speed Crayford (11:1), accepts 2" and 1.25" Focuser: Dual-speed Crayford (11:1), accepts 2" and 1.25" eyepieces with included adapter eyepieces with included adapter Optical tube material: Rolled steel... - Page 27 SkyQuest XT12g Primary mirror: 305mm diameter, parabolic, center-marked Focal length: 1500mm Focal ratio: f/4.9 Focuser: Dual-speed Crayford (11:1), accepts 2" and 1.25" eyepieces Optical tube material: Rolled steel Azimuth bearing: Thrust needle bearing Altitude bearing: Ball bearing Eyepieces: 28mm DeepView, 2" barrel, 12.5mm Illuminated Plössl, 1.25"...
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Page 28: Menu Tree
Menu Tree... -
Page 30: Appendix B: Rs-232 Connection
Appendix B: RS-232 a. Positive Azm tracking: 80, 3, 16, 6, TrackRateHighByte, TrackRateLowByte, 0, 0 Connection b. Negative Azm tracking: 80, 3, 16, 7, TrackRateHighByte, TrackRateLowByte, 0, 0 The SkyQuest XTg Mount is designed to receive commands sent from a computer’s RS-232 COM port (via the computer c. -
Page 31: Star Charts
Star Charts... - Page 40 One-Year Limited Warranty The Orion XTg GoTo Dobsonians are 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 to: Orion Warranty Repair, 89 Hangar Way, Watsonville, CA 95076.
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Questions and answers
how to disassemble and clean the base on XT10G
To disassemble the base of the Orion XT10G:
1. Unthread the six screws connecting the rear end ring to the tube (Figure 12).
2. Loosen panel screws enough to separate the side panels from the baseplate.
3. Remove the azimuth motor connection cable by unplugging both ends.
4. Detach the eyepiece rack by loosening the screws and sliding it upward.
5. Remove the hand controller holster by unscrewing it from the altitude motor.
For cleaning:
- Do not remove the polyethylene foam strip between baseplates; it protects the azimuth motor.
- Use a blower bulb or compressed air to remove dust.
- Do not apply fluid directly to optics; use lens tissue with cleaner.
- Wipe in circular motion and dry completely before reassembly.
Avoid over-tightening screws during reassembly.
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